diff --git a/common/rfb/CConnection.cxx b/common/rfb/CConnection.cxx
index 4e8ea4e..bdde325 100644
--- a/common/rfb/CConnection.cxx
+++ b/common/rfb/CConnection.cxx
@@ -21,6 +21,7 @@
 #include <string.h>
 
 #include <rfb/Exception.h>
+#include <rfb/clipboardTypes.h>
 #include <rfb/fenceTypes.h>
 #include <rfb/CMsgReader.h>
 #include <rfb/CMsgWriter.h>
@@ -53,7 +54,7 @@
     firstUpdate(true), pendingUpdate(false), continuousUpdates(false),
     forceNonincremental(true),
     framebuffer(NULL), decoder(this),
-    serverClipboard(NULL)
+    serverClipboard(NULL), hasLocalClipboard(false)
 {
 }
 
@@ -467,6 +468,8 @@
 
 void CConnection::serverCutText(const char* str)
 {
+  hasLocalClipboard = false;
+
   strFree(serverClipboard);
   serverClipboard = NULL;
 
@@ -475,6 +478,67 @@
   handleClipboardAnnounce(true);
 }
 
+void CConnection::handleClipboardCaps(rdr::U32 flags,
+                                      const rdr::U32* lengths)
+{
+  rdr::U32 sizes[] = { 0 };
+
+  CMsgHandler::handleClipboardCaps(flags, lengths);
+
+  writer()->writeClipboardCaps(rfb::clipboardUTF8 |
+                               rfb::clipboardRequest |
+                               rfb::clipboardPeek |
+                               rfb::clipboardNotify |
+                               rfb::clipboardProvide,
+                               sizes);
+}
+
+void CConnection::handleClipboardRequest(rdr::U32 flags)
+{
+  if (!(flags & rfb::clipboardUTF8))
+    return;
+  if (!hasLocalClipboard)
+    return;
+  handleClipboardRequest();
+}
+
+void CConnection::handleClipboardPeek(rdr::U32 flags)
+{
+  if (!hasLocalClipboard)
+    return;
+  if (server.clipboardFlags() & rfb::clipboardNotify)
+    writer()->writeClipboardNotify(rfb::clipboardUTF8);
+}
+
+void CConnection::handleClipboardNotify(rdr::U32 flags)
+{
+  strFree(serverClipboard);
+  serverClipboard = NULL;
+
+  if (flags & rfb::clipboardUTF8) {
+    hasLocalClipboard = false;
+    handleClipboardAnnounce(true);
+  } else {
+    handleClipboardAnnounce(false);
+  }
+}
+
+void CConnection::handleClipboardProvide(rdr::U32 flags,
+                                         const size_t* lengths,
+                                         const rdr::U8* const* data)
+{
+  if (!(flags & rfb::clipboardUTF8))
+    return;
+
+  strFree(serverClipboard);
+  serverClipboard = NULL;
+
+  serverClipboard = convertLF((const char*)data[0], lengths[0]);
+
+  // FIXME: Should probably verify that this data was actually requested
+  handleClipboardData(serverClipboard);
+}
+
 void CConnection::authSuccess()
 {
 }
@@ -506,19 +570,35 @@
     handleClipboardData(serverClipboard);
     return;
   }
+
+  if (server.clipboardFlags() & rfb::clipboardRequest)
+    writer()->writeClipboardRequest(rfb::clipboardUTF8);
 }
 
 void CConnection::announceClipboard(bool available)
 {
-  if (available)
-    handleClipboardRequest();
+  hasLocalClipboard = available;
+
+  if (server.clipboardFlags() & rfb::clipboardNotify)
+    writer()->writeClipboardNotify(available ? rfb::clipboardUTF8 : 0);
+  else {
+    if (available)
+      handleClipboardRequest();
+  }
 }
 
 void CConnection::sendClipboardData(const char* data)
 {
-  CharArray latin1(utf8ToLatin1(data));
+  if (server.clipboardFlags() & rfb::clipboardProvide) {
+    CharArray filtered(convertCRLF(data));
+    size_t sizes[1] = { strlen(filtered.buf) + 1 };
+    const rdr::U8* data[1] = { (const rdr::U8*)filtered.buf };
+    writer()->writeClipboardProvide(rfb::clipboardUTF8, sizes, data);
+  } else {
+    CharArray latin1(utf8ToLatin1(data));
 
-  writer()->writeClientCutText(latin1.buf);
+    writer()->writeClientCutText(latin1.buf);
+  }
 }
 
 void CConnection::refreshFramebuffer()
@@ -656,6 +736,7 @@
 
   encodings.push_back(pseudoEncodingDesktopName);
   encodings.push_back(pseudoEncodingLastRect);
+  encodings.push_back(pseudoEncodingExtendedClipboard);
   encodings.push_back(pseudoEncodingContinuousUpdates);
   encodings.push_back(pseudoEncodingFence);
   encodings.push_back(pseudoEncodingQEMUKeyEvent);
diff --git a/common/rfb/CConnection.h b/common/rfb/CConnection.h
index 4106a1e..f01d5d3 100644
--- a/common/rfb/CConnection.h
+++ b/common/rfb/CConnection.h
@@ -111,6 +111,15 @@
 
     virtual void serverCutText(const char* str);
 
+    virtual void handleClipboardCaps(rdr::U32 flags,
+                                     const rdr::U32* lengths);
+    virtual void handleClipboardRequest(rdr::U32 flags);
+    virtual void handleClipboardPeek(rdr::U32 flags);
+    virtual void handleClipboardNotify(rdr::U32 flags);
+    virtual void handleClipboardProvide(rdr::U32 flags,
+                                        const size_t* lengths,
+                                        const rdr::U8* const* data);
+
 
     // Methods to be overridden in a derived class
 
@@ -277,6 +286,7 @@
     DecodeManager decoder;
 
     char* serverClipboard;
+    bool hasLocalClipboard;
   };
 }
 #endif
diff --git a/common/rfb/CMsgHandler.cxx b/common/rfb/CMsgHandler.cxx
index c009067..9dab5d9 100644
--- a/common/rfb/CMsgHandler.cxx
+++ b/common/rfb/CMsgHandler.cxx
@@ -1,5 +1,5 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
- * Copyright 2009-2011 Pierre Ossman for Cendio AB
+ * Copyright 2009-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -98,3 +98,26 @@
 {
   server.setLEDState(state);
 }
+
+void CMsgHandler::handleClipboardCaps(rdr::U32 flags, const rdr::U32* lengths)
+{
+  server.setClipboardCaps(flags, lengths);
+}
+
+void CMsgHandler::handleClipboardRequest(rdr::U32 flags)
+{
+}
+
+void CMsgHandler::handleClipboardPeek(rdr::U32 flags)
+{
+}
+
+void CMsgHandler::handleClipboardNotify(rdr::U32 flags)
+{
+}
+
+void CMsgHandler::handleClipboardProvide(rdr::U32 flags,
+                                         const size_t* lengths,
+                                         const rdr::U8* const* data)
+{
+}
diff --git a/common/rfb/CMsgHandler.h b/common/rfb/CMsgHandler.h
index 1581f79..84dd115 100644
--- a/common/rfb/CMsgHandler.h
+++ b/common/rfb/CMsgHandler.h
@@ -1,5 +1,5 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
- * Copyright 2009-2011 Pierre Ossman for Cendio AB
+ * Copyright 2009-2019 Pierre Ossman for Cendio AB
  * Copyright (C) 2011 D. R. Commander.  All Rights Reserved.
  * 
  * This is free software; you can redistribute it and/or modify
@@ -42,8 +42,9 @@
     // The following methods are called as corresponding messages are read.  A
     // derived class should override these methods as desired.  Note that for
     // the setDesktopSize(), setExtendedDesktopSize(), setPixelFormat(),
-    // setName() and serverInit() methods, a derived class should call on to
-    // CMsgHandler's methods to set the members of "server" appropriately.
+    // setName(), serverInit() and clipboardCaps methods, a derived class
+    // should call on to CMsgHandler's methods to set the members of "server"
+    // appropriately.
 
     virtual void setDesktopSize(int w, int h);
     virtual void setExtendedDesktopSize(unsigned reason, unsigned result,
@@ -74,6 +75,15 @@
 
     virtual void setLEDState(unsigned int state);
 
+    virtual void handleClipboardCaps(rdr::U32 flags,
+                                     const rdr::U32* lengths);
+    virtual void handleClipboardRequest(rdr::U32 flags);
+    virtual void handleClipboardPeek(rdr::U32 flags);
+    virtual void handleClipboardNotify(rdr::U32 flags);
+    virtual void handleClipboardProvide(rdr::U32 flags,
+                                        const size_t* lengths,
+                                        const rdr::U8* const* data);
+
     ServerParams server;
   };
 }
diff --git a/common/rfb/CMsgReader.cxx b/common/rfb/CMsgReader.cxx
index 86288ad..a9e12d7 100644
--- a/common/rfb/CMsgReader.cxx
+++ b/common/rfb/CMsgReader.cxx
@@ -1,5 +1,5 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
- * Copyright 2009-2017 Pierre Ossman for Cendio AB
+ * Copyright 2009-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -20,8 +20,11 @@
 #include <assert.h>
 #include <stdio.h>
 
-#include <rfb/msgTypes.h>
 #include <rdr/InStream.h>
+#include <rdr/ZlibInStream.h>
+
+#include <rfb/msgTypes.h>
+#include <rfb/clipboardTypes.h>
 #include <rfb/Exception.h>
 #include <rfb/LogWriter.h>
 #include <rfb/util.h>
@@ -30,6 +33,8 @@
 
 static rfb::LogWriter vlog("CMsgReader");
 
+static rfb::IntParameter maxCutText("MaxCutText", "Maximum permitted length of an incoming clipboard update", 256*1024);
+
 using namespace rfb;
 
 CMsgReader::CMsgReader(CMsgHandler* handler_, rdr::InStream* is_)
@@ -152,7 +157,15 @@
 {
   is->skip(3);
   rdr::U32 len = is->readU32();
-  if (len > 256*1024) {
+
+  if (len & 0x80000000) {
+    rdr::S32 slen = len;
+    slen = -slen;
+    readExtendedClipboard(slen);
+    return;
+  }
+
+  if (len > (size_t)maxCutText) {
     is->skip(len);
     vlog.error("cut text too long (%d bytes) - ignoring",len);
     return;
@@ -163,6 +176,99 @@
   handler->serverCutText(filtered.buf);
 }
 
+void CMsgReader::readExtendedClipboard(rdr::S32 len)
+{
+  rdr::U32 flags;
+  rdr::U32 action;
+
+  if (len < 4)
+    throw Exception("Invalid extended clipboard message");
+  if (len > maxCutText) {
+    vlog.error("Extended clipboard message too long (%d bytes) - ignoring", len);
+    is->skip(len);
+    return;
+  }
+
+  flags = is->readU32();
+  action = flags & clipboardActionMask;
+
+  if (action & clipboardCaps) {
+    int i;
+    size_t num;
+    rdr::U32 lengths[16];
+
+    num = 0;
+    for (i = 0;i < 16;i++) {
+      if (flags & (1 << i))
+        num++;
+    }
+
+    if (len < (rdr::S32)(4 + 4*num))
+      throw Exception("Invalid extended clipboard message");
+
+    num = 0;
+    for (i = 0;i < 16;i++) {
+      if (flags & (1 << i))
+        lengths[num++] = is->readU32();
+    }
+
+    handler->handleClipboardCaps(flags, lengths);
+  } else if (action == clipboardProvide) {
+    rdr::ZlibInStream zis;
+
+    int i;
+    size_t num;
+    size_t lengths[16];
+    rdr::U8* buffers[16];
+
+    zis.setUnderlying(is, len - 4);
+
+    num = 0;
+    for (i = 0;i < 16;i++) {
+      if (!(flags & 1 << i))
+        continue;
+
+      lengths[num] = zis.readU32();
+      if (lengths[num] > (size_t)maxCutText) {
+        vlog.error("Extended clipboard data too long (%d bytes) - ignoring",
+                   (unsigned)lengths[num]);
+        zis.skip(lengths[num]);
+        flags &= ~(1 << i);
+        continue;
+      }
+
+      buffers[num] = new rdr::U8[lengths[num]];
+      zis.readBytes(buffers[num], lengths[num]);
+      num++;
+    }
+
+    zis.removeUnderlying();
+
+    handler->handleClipboardProvide(flags, lengths, buffers);
+
+    num = 0;
+    for (i = 0;i < 16;i++) {
+      if (!(flags & 1 << i))
+        continue;
+      delete [] buffers[num++];
+    }
+  } else {
+    switch (action) {
+    case clipboardRequest:
+      handler->handleClipboardRequest(flags);
+      break;
+    case clipboardPeek:
+      handler->handleClipboardPeek(flags);
+      break;
+    case clipboardNotify:
+      handler->handleClipboardNotify(flags);
+      break;
+    default:
+      throw Exception("Invalid extended clipboard action");
+    }
+  }
+}
+
 void CMsgReader::readFence()
 {
   rdr::U32 flags;
diff --git a/common/rfb/CMsgReader.h b/common/rfb/CMsgReader.h
index 03f3d8d..050990a 100644
--- a/common/rfb/CMsgReader.h
+++ b/common/rfb/CMsgReader.h
@@ -1,5 +1,5 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
- * Copyright 2009-2014 Pierre Ossman for Cendio AB
+ * Copyright 2009-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -53,6 +53,7 @@
     void readSetColourMapEntries();
     void readBell();
     void readServerCutText();
+    void readExtendedClipboard(rdr::S32 len);
     void readFence();
     void readEndOfContinuousUpdates();
 
diff --git a/common/rfb/CMsgWriter.cxx b/common/rfb/CMsgWriter.cxx
index f1fa58d..3180391 100644
--- a/common/rfb/CMsgWriter.cxx
+++ b/common/rfb/CMsgWriter.cxx
@@ -1,5 +1,5 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
- * Copyright 2009-2014 Pierre Ossman for Cendio AB
+ * Copyright 2009-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -17,10 +17,15 @@
  * USA.
  */
 #include <stdio.h>
+
 #include <rdr/OutStream.h>
+#include <rdr/MemOutStream.h>
+#include <rdr/ZlibOutStream.h>
+
 #include <rfb/msgTypes.h>
 #include <rfb/fenceTypes.h>
 #include <rfb/qemuTypes.h>
+#include <rfb/clipboardTypes.h>
 #include <rfb/Exception.h>
 #include <rfb/PixelFormat.h>
 #include <rfb/Rect.h>
@@ -194,6 +199,104 @@
   endMsg();
 }
 
+void CMsgWriter::writeClipboardCaps(rdr::U32 caps,
+                                    const rdr::U32* lengths)
+{
+  size_t i, count;
+
+  if (!(server->clipboardFlags() & clipboardCaps))
+    throw Exception("Server does not support clipboard \"caps\" action");
+
+  count = 0;
+  for (i = 0;i < 16;i++) {
+    if (caps & (1 << i))
+      count++;
+  }
+
+  startMsg(msgTypeClientCutText);
+  os->pad(3);
+  os->writeS32(-(4 + 4 * count));
+
+  os->writeU32(caps | clipboardCaps);
+
+  count = 0;
+  for (i = 0;i < 16;i++) {
+    if (caps & (1 << i))
+      os->writeU32(lengths[count++]);
+  }
+
+  endMsg();
+}
+
+void CMsgWriter::writeClipboardRequest(rdr::U32 flags)
+{
+  if (!(server->clipboardFlags() & clipboardRequest))
+    throw Exception("Server does not support clipboard \"request\" action");
+
+  startMsg(msgTypeClientCutText);
+  os->pad(3);
+  os->writeS32(-4);
+  os->writeU32(flags | clipboardRequest);
+  endMsg();
+}
+
+void CMsgWriter::writeClipboardPeek(rdr::U32 flags)
+{
+  if (!(server->clipboardFlags() & clipboardPeek))
+    throw Exception("Server does not support clipboard \"peek\" action");
+
+  startMsg(msgTypeClientCutText);
+  os->pad(3);
+  os->writeS32(-4);
+  os->writeU32(flags | clipboardPeek);
+  endMsg();
+}
+
+void CMsgWriter::writeClipboardNotify(rdr::U32 flags)
+{
+  if (!(server->clipboardFlags() & clipboardNotify))
+    throw Exception("Server does not support clipboard \"notify\" action");
+
+  startMsg(msgTypeClientCutText);
+  os->pad(3);
+  os->writeS32(-4);
+  os->writeU32(flags | clipboardNotify);
+  endMsg();
+}
+
+void CMsgWriter::writeClipboardProvide(rdr::U32 flags,
+                                      const size_t* lengths,
+                                      const rdr::U8* const* data)
+{
+  rdr::MemOutStream mos;
+  rdr::ZlibOutStream zos;
+
+  int i, count;
+
+  if (!(server->clipboardFlags() & clipboardProvide))
+    throw Exception("Server does not support clipboard \"provide\" action");
+
+  zos.setUnderlying(&mos);
+
+  count = 0;
+  for (i = 0;i < 16;i++) {
+    if (!(flags & (1 << i)))
+      continue;
+    zos.writeU32(lengths[count]);
+    zos.writeBytes(data[count], lengths[count]);
+    count++;
+  }
+
+  zos.flush();
+
+  startMsg(msgTypeClientCutText);
+  os->pad(3);
+  os->writeS32(-(4 + mos.length()));
+  os->writeU32(flags | clipboardProvide);
+  os->writeBytes(mos.data(), mos.length());
+  endMsg();
+}
+
 void CMsgWriter::startMsg(int type)
 {
   os->writeU8(type);
diff --git a/common/rfb/CMsgWriter.h b/common/rfb/CMsgWriter.h
index d3ac19c..7b83939 100644
--- a/common/rfb/CMsgWriter.h
+++ b/common/rfb/CMsgWriter.h
@@ -1,5 +1,5 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
- * Copyright 2009-2014 Pierre Ossman for Cendio AB
+ * Copyright 2009-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -55,8 +55,16 @@
 
     void writeKeyEvent(rdr::U32 keysym, rdr::U32 keycode, bool down);
     void writePointerEvent(const Point& pos, int buttonMask);
+
     void writeClientCutText(const char* str);
 
+    void writeClipboardCaps(rdr::U32 caps, const rdr::U32* lengths);
+    void writeClipboardRequest(rdr::U32 flags);
+    void writeClipboardPeek(rdr::U32 flags);
+    void writeClipboardNotify(rdr::U32 flags);
+    void writeClipboardProvide(rdr::U32 flags, const size_t* lengths,
+                               const rdr::U8* const* data);
+
   protected:
     void startMsg(int type);
     void endMsg();
diff --git a/common/rfb/ClientParams.cxx b/common/rfb/ClientParams.cxx
index e42d494..987abe3 100644
--- a/common/rfb/ClientParams.cxx
+++ b/common/rfb/ClientParams.cxx
@@ -1,6 +1,6 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
  * Copyright (C) 2011 D. R. Commander.  All Rights Reserved.
- * Copyright 2014-2018 Pierre Ossman for Cendio AB
+ * Copyright 2014-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -20,6 +20,7 @@
 #include <rfb/Exception.h>
 #include <rfb/encodings.h>
 #include <rfb/ledStates.h>
+#include <rfb/clipboardTypes.h>
 #include <rfb/ClientParams.h>
 
 using namespace rfb;
@@ -32,7 +33,13 @@
     ledState_(ledUnknown)
 {
   setName("");
+
   cursor_ = new Cursor(0, 0, Point(), NULL);
+
+  clipFlags = clipboardUTF8 | clipboardRTF | clipboardHTML |
+              clipboardRequest | clipboardNotify | clipboardProvide;
+  memset(clipSizes, 0, sizeof(clipSizes));
+  clipSizes[0] = 20 * 1024 * 1024;
 }
 
 ClientParams::~ClientParams()
@@ -136,6 +143,20 @@
   ledState_ = state;
 }
 
+void ClientParams::setClipboardCaps(rdr::U32 flags, const rdr::U32* lengths)
+{
+  int i, num;
+
+  clipFlags = flags;
+
+  num = 0;
+  for (i = 0;i < 16;i++) {
+    if (!(flags & (1 << i)))
+      continue;
+    clipSizes[i] = lengths[num++];
+  }
+}
+
 bool ClientParams::supportsLocalCursor() const
 {
   if (supportsEncoding(pseudoEncodingCursorWithAlpha))
diff --git a/common/rfb/ClientParams.h b/common/rfb/ClientParams.h
index f7a7044..aab3d64 100644
--- a/common/rfb/ClientParams.h
+++ b/common/rfb/ClientParams.h
@@ -1,5 +1,5 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
- * Copyright 2014-2018 Pierre Ossman for Cendio AB
+ * Copyright 2014-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -84,6 +84,9 @@
     unsigned int ledState() { return ledState_; }
     void setLEDState(unsigned int state);
 
+    rdr::U32 clipboardFlags() const { return clipFlags; }
+    void setClipboardCaps(rdr::U32 flags, const rdr::U32* lengths);
+
     // Wrappers to check for functionality rather than specific
     // encodings
     bool supportsLocalCursor() const;
@@ -108,6 +111,8 @@
     Cursor* cursor_;
     std::set<rdr::S32> encodings_;
     unsigned int ledState_;
+    rdr::U32 clipFlags;
+    rdr::U32 clipSizes[16];
   };
 }
 #endif
diff --git a/common/rfb/SConnection.cxx b/common/rfb/SConnection.cxx
index 46f0a85..4869199 100644
--- a/common/rfb/SConnection.cxx
+++ b/common/rfb/SConnection.cxx
@@ -20,6 +20,7 @@
 #include <string.h>
 #include <rfb/Exception.h>
 #include <rfb/Security.h>
+#include <rfb/clipboardTypes.h>
 #include <rfb/msgTypes.h>
 #include <rfb/fenceTypes.h>
 #include <rfb/SMsgReader.h>
@@ -53,7 +54,7 @@
     is(0), os(0), reader_(0), writer_(0),
     ssecurity(0), state_(RFBSTATE_UNINITIALISED),
     preferredEncoding(encodingRaw),
-    clientClipboard(NULL)
+    clientClipboard(NULL), hasLocalClipboard(false)
 {
   defaultMajorVersion = 3;
   defaultMinorVersion = 8;
@@ -299,6 +300,16 @@
   }
 
   SMsgHandler::setEncodings(nEncodings, encodings);
+
+  if (client.supportsEncoding(pseudoEncodingExtendedClipboard)) {
+    rdr::U32 sizes[] = { 0 };
+    writer()->writeClipboardCaps(rfb::clipboardUTF8 |
+                                 rfb::clipboardRequest |
+                                 rfb::clipboardPeek |
+                                 rfb::clipboardNotify |
+                                 rfb::clipboardProvide,
+                                 sizes);
+  }
 }
 
 void SConnection::clientCutText(const char* str)
@@ -311,6 +322,49 @@
   handleClipboardAnnounce(true);
 }
 
+void SConnection::handleClipboardRequest(rdr::U32 flags)
+{
+  if (!(flags & rfb::clipboardUTF8))
+    return;
+  if (!hasLocalClipboard)
+    return;
+  handleClipboardRequest();
+}
+
+void SConnection::handleClipboardPeek(rdr::U32 flags)
+{
+  if (!hasLocalClipboard)
+    return;
+  if (client.clipboardFlags() & rfb::clipboardNotify)
+    writer()->writeClipboardNotify(rfb::clipboardUTF8);
+}
+
+void SConnection::handleClipboardNotify(rdr::U32 flags)
+{
+  strFree(clientClipboard);
+  clientClipboard = NULL;
+
+  if (flags & rfb::clipboardUTF8)
+    handleClipboardAnnounce(true);
+  else
+    handleClipboardAnnounce(false);
+}
+
+void SConnection::handleClipboardProvide(rdr::U32 flags,
+                                         const size_t* lengths,
+                                         const rdr::U8* const* data)
+{
+  if (!(flags & rfb::clipboardUTF8))
+    return;
+
+  strFree(clientClipboard);
+  clientClipboard = NULL;
+
+  clientClipboard = convertLF((const char*)data[0], lengths[0]);
+
+  handleClipboardData(clientClipboard);
+}
+
 void SConnection::supportsQEMUKeyEvent()
 {
   writer()->writeQEMUKeyEvent();
@@ -440,19 +494,38 @@
     handleClipboardData(clientClipboard);
     return;
   }
+
+  if (client.supportsEncoding(pseudoEncodingExtendedClipboard) &&
+      (client.clipboardFlags() & rfb::clipboardRequest))
+    writer()->writeClipboardRequest(rfb::clipboardUTF8);
 }
 
 void SConnection::announceClipboard(bool available)
 {
-  if (available)
-    handleClipboardRequest();
+  hasLocalClipboard = available;
+
+  if (client.supportsEncoding(pseudoEncodingExtendedClipboard) &&
+      (client.clipboardFlags() & rfb::clipboardNotify))
+    writer()->writeClipboardNotify(available ? rfb::clipboardUTF8 : 0);
+  else {
+    if (available)
+      handleClipboardRequest();
+  }
 }
 
 void SConnection::sendClipboardData(const char* data)
 {
-  CharArray latin1(utf8ToLatin1(data));
+  if (client.supportsEncoding(pseudoEncodingExtendedClipboard) &&
+      (client.clipboardFlags() & rfb::clipboardProvide)) {
+    CharArray filtered(convertCRLF(data));
+    size_t sizes[1] = { strlen(filtered.buf) + 1 };
+    const rdr::U8* data[1] = { (const rdr::U8*)filtered.buf };
+    writer()->writeClipboardProvide(rfb::clipboardUTF8, sizes, data);
+  } else {
+    CharArray latin1(utf8ToLatin1(data));
 
-  writer()->writeServerCutText(latin1.buf);
+    writer()->writeServerCutText(latin1.buf);
+  }
 }
 
 void SConnection::writeFakeColourMap(void)
diff --git a/common/rfb/SConnection.h b/common/rfb/SConnection.h
index 6c80569..db3ab08 100644
--- a/common/rfb/SConnection.h
+++ b/common/rfb/SConnection.h
@@ -82,6 +82,13 @@
 
     virtual void clientCutText(const char* str);
 
+    virtual void handleClipboardRequest(rdr::U32 flags);
+    virtual void handleClipboardPeek(rdr::U32 flags);
+    virtual void handleClipboardNotify(rdr::U32 flags);
+    virtual void handleClipboardProvide(rdr::U32 flags,
+                                        const size_t* lengths,
+                                        const rdr::U8* const* data);
+
     virtual void supportsQEMUKeyEvent();
 
 
@@ -247,6 +254,7 @@
     AccessRights accessRights;
 
     char* clientClipboard;
+    bool hasLocalClipboard;
   };
 }
 #endif
diff --git a/common/rfb/SMsgHandler.cxx b/common/rfb/SMsgHandler.cxx
index f952ec2..32b561e 100644
--- a/common/rfb/SMsgHandler.cxx
+++ b/common/rfb/SMsgHandler.cxx
@@ -1,5 +1,5 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
- * Copyright 2009-2011 Pierre Ossman for Cendio AB
+ * Copyright 2009-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -64,6 +64,29 @@
     supportsQEMUKeyEvent();
 }
 
+void SMsgHandler::handleClipboardCaps(rdr::U32 flags, const rdr::U32* lengths)
+{
+  client.setClipboardCaps(flags, lengths);
+}
+
+void SMsgHandler::handleClipboardRequest(rdr::U32 flags)
+{
+}
+
+void SMsgHandler::handleClipboardPeek(rdr::U32 flags)
+{
+}
+
+void SMsgHandler::handleClipboardNotify(rdr::U32 flags)
+{
+}
+
+void SMsgHandler::handleClipboardProvide(rdr::U32 flags,
+                                         const size_t* lengths,
+                                         const rdr::U8* const* data)
+{
+}
+
 void SMsgHandler::supportsLocalCursor()
 {
 }
diff --git a/common/rfb/SMsgHandler.h b/common/rfb/SMsgHandler.h
index 8548d91..b290f19 100644
--- a/common/rfb/SMsgHandler.h
+++ b/common/rfb/SMsgHandler.h
@@ -1,5 +1,5 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
- * Copyright 2009-2011 Pierre Ossman for Cendio AB
+ * Copyright 2009-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -40,8 +40,8 @@
 
     // The following methods are called as corresponding messages are read.  A
     // derived class should override these methods as desired.  Note that for
-    // the setPixelFormat(), and setEncodings() methods, a derived class must
-    // call on to SMsgHandler's methods.
+    // the setPixelFormat(), setEncodings() and clipboardCaps() methods, a
+    // derived class must call on to SMsgHandler's methods.
 
     virtual void clientInit(bool shared);
 
@@ -54,6 +54,15 @@
     virtual void enableContinuousUpdates(bool enable,
                                          int x, int y, int w, int h) = 0;
 
+    virtual void handleClipboardCaps(rdr::U32 flags,
+                                     const rdr::U32* lengths);
+    virtual void handleClipboardRequest(rdr::U32 flags);
+    virtual void handleClipboardPeek(rdr::U32 flags);
+    virtual void handleClipboardNotify(rdr::U32 flags);
+    virtual void handleClipboardProvide(rdr::U32 flags,
+                                        const size_t* lengths,
+                                        const rdr::U8* const* data);
+
     // InputHandler interface
     // The InputHandler methods will be called for the corresponding messages.
 
diff --git a/common/rfb/SMsgReader.cxx b/common/rfb/SMsgReader.cxx
index 5efbfe2..ab42e59 100644
--- a/common/rfb/SMsgReader.cxx
+++ b/common/rfb/SMsgReader.cxx
@@ -1,5 +1,5 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
- * Copyright 2009-2014 Pierre Ossman for Cendio AB
+ * Copyright 2009-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -17,9 +17,13 @@
  * USA.
  */
 #include <stdio.h>
+
 #include <rdr/InStream.h>
+#include <rdr/ZlibInStream.h>
+
 #include <rfb/msgTypes.h>
 #include <rfb/qemuTypes.h>
+#include <rfb/clipboardTypes.h>
 #include <rfb/Exception.h>
 #include <rfb/util.h>
 #include <rfb/SMsgHandler.h>
@@ -203,11 +207,16 @@
 void SMsgReader::readClientCutText()
 {
   is->skip(3);
-  int len = is->readU32();
-  if (len < 0) {
-    throw Exception("Cut text too long.");
+  rdr::U32 len = is->readU32();
+
+  if (len & 0x80000000) {
+    rdr::S32 slen = len;
+    slen = -slen;
+    readExtendedClipboard(slen);
+    return;
   }
-  if (len > maxCutText) {
+
+  if (len > (size_t)maxCutText) {
     is->skip(len);
     vlog.error("Cut text too long (%d bytes) - ignoring", len);
     return;
@@ -218,6 +227,99 @@
   handler->clientCutText(filtered.buf);
 }
 
+void SMsgReader::readExtendedClipboard(rdr::S32 len)
+{
+  rdr::U32 flags;
+  rdr::U32 action;
+
+  if (len < 4)
+    throw Exception("Invalid extended clipboard message");
+  if (len > maxCutText) {
+    vlog.error("Extended clipboard message too long (%d bytes) - ignoring", len);
+    is->skip(len);
+    return;
+  }
+
+  flags = is->readU32();
+  action = flags & clipboardActionMask;
+
+  if (action & clipboardCaps) {
+    int i;
+    size_t num;
+    rdr::U32 lengths[16];
+
+    num = 0;
+    for (i = 0;i < 16;i++) {
+      if (flags & (1 << i))
+        num++;
+    }
+
+    if (len < (rdr::S32)(4 + 4*num))
+      throw Exception("Invalid extended clipboard message");
+
+    num = 0;
+    for (i = 0;i < 16;i++) {
+      if (flags & (1 << i))
+        lengths[num++] = is->readU32();
+    }
+
+    handler->handleClipboardCaps(flags, lengths);
+  } else if (action == clipboardProvide) {
+    rdr::ZlibInStream zis;
+
+    int i;
+    size_t num;
+    size_t lengths[16];
+    rdr::U8* buffers[16];
+
+    zis.setUnderlying(is, len - 4);
+
+    num = 0;
+    for (i = 0;i < 16;i++) {
+      if (!(flags & 1 << i))
+        continue;
+
+      lengths[num] = zis.readU32();
+      if (lengths[num] > (size_t)maxCutText) {
+        vlog.error("Extended clipboard data too long (%d bytes) - ignoring",
+                   (unsigned)lengths[num]);
+        zis.skip(lengths[num]);
+        flags &= ~(1 << i);
+        continue;
+      }
+
+      buffers[num] = new rdr::U8[lengths[num]];
+      zis.readBytes(buffers[num], lengths[num]);
+      num++;
+    }
+
+    zis.removeUnderlying();
+
+    handler->handleClipboardProvide(flags, lengths, buffers);
+
+    num = 0;
+    for (i = 0;i < 16;i++) {
+      if (!(flags & 1 << i))
+        continue;
+      delete [] buffers[num++];
+    }
+  } else {
+    switch (action) {
+    case clipboardRequest:
+      handler->handleClipboardRequest(flags);
+      break;
+    case clipboardPeek:
+      handler->handleClipboardPeek(flags);
+      break;
+    case clipboardNotify:
+      handler->handleClipboardNotify(flags);
+      break;
+    default:
+      throw Exception("Invalid extended clipboard action");
+    }
+  }
+}
+
 void SMsgReader::readQEMUMessage()
 {
   int subType = is->readU8();
diff --git a/common/rfb/SMsgReader.h b/common/rfb/SMsgReader.h
index 146b29f..4991fd3 100644
--- a/common/rfb/SMsgReader.h
+++ b/common/rfb/SMsgReader.h
@@ -1,5 +1,5 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
- * Copyright 2009-2014 Pierre Ossman for Cendio AB
+ * Copyright 2009-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -54,6 +54,7 @@
     void readKeyEvent();
     void readPointerEvent();
     void readClientCutText();
+    void readExtendedClipboard(rdr::S32 len);
 
     void readQEMUMessage();
     void readQEMUKeyEvent();
diff --git a/common/rfb/SMsgWriter.cxx b/common/rfb/SMsgWriter.cxx
index 3d5a64c..becf6e7 100644
--- a/common/rfb/SMsgWriter.cxx
+++ b/common/rfb/SMsgWriter.cxx
@@ -1,6 +1,6 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
  * Copyright (C) 2011 D. R. Commander.  All Rights Reserved.
- * Copyright 2009-2017 Pierre Ossman for Cendio AB
+ * Copyright 2009-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -18,9 +18,14 @@
  * USA.
  */
 #include <stdio.h>
+
 #include <rdr/OutStream.h>
+#include <rdr/MemOutStream.h>
+#include <rdr/ZlibOutStream.h>
+
 #include <rfb/msgTypes.h>
 #include <rfb/fenceTypes.h>
+#include <rfb/clipboardTypes.h>
 #include <rfb/Exception.h>
 #include <rfb/ClientParams.h>
 #include <rfb/UpdateTracker.h>
@@ -93,6 +98,112 @@
   endMsg();
 }
 
+void SMsgWriter::writeClipboardCaps(rdr::U32 caps,
+                                    const rdr::U32* lengths)
+{
+  size_t i, count;
+
+  if (!client->supportsEncoding(pseudoEncodingExtendedClipboard))
+    throw Exception("Client does not support extended clipboard");
+
+  count = 0;
+  for (i = 0;i < 16;i++) {
+    if (caps & (1 << i))
+      count++;
+  }
+
+  startMsg(msgTypeServerCutText);
+  os->pad(3);
+  os->writeS32(-(4 + 4 * count));
+
+  os->writeU32(caps | clipboardCaps);
+
+  count = 0;
+  for (i = 0;i < 16;i++) {
+    if (caps & (1 << i))
+      os->writeU32(lengths[count++]);
+  }
+
+  endMsg();
+}
+
+void SMsgWriter::writeClipboardRequest(rdr::U32 flags)
+{
+  if (!client->supportsEncoding(pseudoEncodingExtendedClipboard))
+    throw Exception("Client does not support extended clipboard");
+  if (!(client->clipboardFlags() & clipboardRequest))
+    throw Exception("Client does not support clipboard \"request\" action");
+
+  startMsg(msgTypeServerCutText);
+  os->pad(3);
+  os->writeS32(-4);
+  os->writeU32(flags | clipboardRequest);
+  endMsg();
+}
+
+void SMsgWriter::writeClipboardPeek(rdr::U32 flags)
+{
+  if (!client->supportsEncoding(pseudoEncodingExtendedClipboard))
+    throw Exception("Client does not support extended clipboard");
+  if (!(client->clipboardFlags() & clipboardPeek))
+    throw Exception("Client does not support clipboard \"peek\" action");
+
+  startMsg(msgTypeServerCutText);
+  os->pad(3);
+  os->writeS32(-4);
+  os->writeU32(flags | clipboardPeek);
+  endMsg();
+}
+
+void SMsgWriter::writeClipboardNotify(rdr::U32 flags)
+{
+  if (!client->supportsEncoding(pseudoEncodingExtendedClipboard))
+    throw Exception("Client does not support extended clipboard");
+  if (!(client->clipboardFlags() & clipboardNotify))
+    throw Exception("Client does not support clipboard \"notify\" action");
+
+  startMsg(msgTypeServerCutText);
+  os->pad(3);
+  os->writeS32(-4);
+  os->writeU32(flags | clipboardNotify);
+  endMsg();
+}
+
+void SMsgWriter::writeClipboardProvide(rdr::U32 flags,
+                                      const size_t* lengths,
+                                      const rdr::U8* const* data)
+{
+  rdr::MemOutStream mos;
+  rdr::ZlibOutStream zos;
+
+  int i, count;
+
+  if (!client->supportsEncoding(pseudoEncodingExtendedClipboard))
+    throw Exception("Client does not support extended clipboard");
+  if (!(client->clipboardFlags() & clipboardProvide))
+    throw Exception("Client does not support clipboard \"provide\" action");
+
+  zos.setUnderlying(&mos);
+
+  count = 0;
+  for (i = 0;i < 16;i++) {
+    if (!(flags & (1 << i)))
+      continue;
+    zos.writeU32(lengths[count]);
+    zos.writeBytes(data[count], lengths[count]);
+    count++;
+  }
+
+  zos.flush();
+
+  startMsg(msgTypeServerCutText);
+  os->pad(3);
+  os->writeS32(-(4 + mos.length()));
+  os->writeU32(flags | clipboardProvide);
+  os->writeBytes(mos.data(), mos.length());
+  endMsg();
+}
+
 void SMsgWriter::writeFence(rdr::U32 flags, unsigned len, const char data[])
 {
   if (!client->supportsEncoding(pseudoEncodingFence))
diff --git a/common/rfb/SMsgWriter.h b/common/rfb/SMsgWriter.h
index 8cf2ae7..2cea44d 100644
--- a/common/rfb/SMsgWriter.h
+++ b/common/rfb/SMsgWriter.h
@@ -1,5 +1,5 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
- * Copyright 2009-2014 Pierre Ossman for Cendio AB
+ * Copyright 2009-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -54,10 +54,18 @@
                                   const rdr::U16 green[],
                                   const rdr::U16 blue[]);
 
-    // writeBell() and writeServerCutText() do the obvious thing.
+    // writeBell() does the obvious thing.
     void writeBell();
+
     void writeServerCutText(const char* str);
 
+    void writeClipboardCaps(rdr::U32 caps, const rdr::U32* lengths);
+    void writeClipboardRequest(rdr::U32 flags);
+    void writeClipboardPeek(rdr::U32 flags);
+    void writeClipboardNotify(rdr::U32 flags);
+    void writeClipboardProvide(rdr::U32 flags, const size_t* lengths,
+                               const rdr::U8* const* data);
+
     // writeFence() sends a new fence request or response to the client.
     void writeFence(rdr::U32 flags, unsigned len, const char data[]);
 
diff --git a/common/rfb/ServerParams.cxx b/common/rfb/ServerParams.cxx
index bfeb80d..a2e3aa8 100644
--- a/common/rfb/ServerParams.cxx
+++ b/common/rfb/ServerParams.cxx
@@ -1,6 +1,6 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
  * Copyright (C) 2011 D. R. Commander.  All Rights Reserved.
- * Copyright 2014-2018 Pierre Ossman for Cendio AB
+ * Copyright 2014-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -32,7 +32,11 @@
     ledState_(ledUnknown)
 {
   setName("");
+
   cursor_ = new Cursor(0, 0, Point(), NULL);
+
+  clipFlags = 0;
+  memset(clipSizes, 0, sizeof(clipSizes));
 }
 
 ServerParams::~ServerParams()
@@ -82,3 +86,17 @@
 {
   ledState_ = state;
 }
+
+void ServerParams::setClipboardCaps(rdr::U32 flags, const rdr::U32* lengths)
+{
+  int i, num;
+
+  clipFlags = flags;
+
+  num = 0;
+  for (i = 0;i < 16;i++) {
+    if (!(flags & (1 << i)))
+      continue;
+    clipSizes[i] = lengths[num++];
+  }
+}
diff --git a/common/rfb/ServerParams.h b/common/rfb/ServerParams.h
index 7a58ea3..c84f625 100644
--- a/common/rfb/ServerParams.h
+++ b/common/rfb/ServerParams.h
@@ -1,5 +1,5 @@
 /* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
- * Copyright 2014-2018 Pierre Ossman for Cendio AB
+ * Copyright 2014-2019 Pierre Ossman for Cendio AB
  * 
  * This is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -69,6 +69,9 @@
     unsigned int ledState() { return ledState_; }
     void setLEDState(unsigned int state);
 
+    rdr::U32 clipboardFlags() const { return clipFlags; }
+    void setClipboardCaps(rdr::U32 flags, const rdr::U32* lengths);
+
     bool supportsQEMUKeyEvent;
     bool supportsSetDesktopSize;
     bool supportsFence;
@@ -84,6 +87,8 @@
     char* name_;
     Cursor* cursor_;
     unsigned int ledState_;
+    rdr::U32 clipFlags;
+    rdr::U32 clipSizes[16];
   };
 }
 #endif
diff --git a/common/rfb/clipboardTypes.h b/common/rfb/clipboardTypes.h
new file mode 100644
index 0000000..bd3fa03
--- /dev/null
+++ b/common/rfb/clipboardTypes.h
@@ -0,0 +1,41 @@
+/* Copyright 2019 Pierre Ossman for Cendio AB
+ * 
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+#ifndef __RFB_CLIPBOARDTYPES_H__
+#define __RFB_CLIPBOARDTYPES_H__
+
+namespace rfb {
+
+  // Formats
+  const unsigned int clipboardUTF8 = 1 << 0;
+  const unsigned int clipboardRTF = 1 << 1;
+  const unsigned int clipboardHTML = 1 << 2;
+  const unsigned int clipboardDIB = 1 << 3;
+  const unsigned int clipboardFiles = 1 << 4;
+
+  const unsigned int clipboardFormatMask = 0x0000ffff;
+
+  // Actions
+  const unsigned int clipboardCaps = 1 << 24;
+  const unsigned int clipboardRequest = 1 << 25;
+  const unsigned int clipboardPeek = 1 << 26;
+  const unsigned int clipboardNotify = 1 << 27;
+  const unsigned int clipboardProvide = 1 << 28;
+
+  const unsigned int clipboardActionMask = 0xff000000;
+}
+#endif
diff --git a/common/rfb/encodings.h b/common/rfb/encodings.h
index acb86ec..cf0c857 100644
--- a/common/rfb/encodings.h
+++ b/common/rfb/encodings.h
@@ -63,6 +63,9 @@
   const int pseudoEncodingVMwareCursor = 0x574d5664;
   const int pseudoEncodingVMwareLEDState = 0x574d5668;
 
+  // UltraVNC-specific
+  const int pseudoEncodingExtendedClipboard = 0xC0A1E5CE;
+
   int encodingNum(const char* name);
   const char* encodingName(int num);
 }