diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 2fc3dde..80ca8a3 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -269,7 +269,6 @@
 enum Permission {
     ACCESS_SURFACE_FLINGER = 0x1,
     ROTATE_SURFACE_FLINGER = 0x2,
-    INTERNAL_SYSTEM_WINDOW = 0x4,
 };
 
 struct IdleTimerConfig {
@@ -317,7 +316,6 @@
 const String16 sControlDisplayBrightness("android.permission.CONTROL_DISPLAY_BRIGHTNESS");
 const String16 sDump("android.permission.DUMP");
 const String16 sCaptureBlackoutContent("android.permission.CAPTURE_BLACKOUT_CONTENT");
-const String16 sInternalSystemWindow("android.permission.INTERNAL_SYSTEM_WINDOW");
 
 const char* KERNEL_IDLE_TIMER_PROP = "graphics.display.kernel_idle_timer.enabled";
 
@@ -360,13 +358,6 @@
             PermissionCache::checkPermission(sRotateSurfaceFlinger, pid, uid);
 }
 
-bool callingThreadHasInternalSystemWindowAccess() {
-    IPCThreadState* ipc = IPCThreadState::self();
-    const int pid = ipc->getCallingPid();
-    const int uid = ipc->getCallingUid();
-    return PermissionCache::checkPermission(sInternalSystemWindow, pid, uid);
-}
-
 SurfaceFlinger::SurfaceFlinger(Factory& factory, SkipInitializationTag)
       : mFactory(factory),
         mPid(getpid()),
@@ -3819,10 +3810,6 @@
         permissions |= Permission::ROTATE_SURFACE_FLINGER;
     }
 
-    if (callingThreadHasInternalSystemWindowAccess()) {
-        permissions |= Permission::INTERNAL_SYSTEM_WINDOW;
-    }
-
     if (!(permissions & Permission::ACCESS_SURFACE_FLINGER) &&
         (flags & (eEarlyWakeupStart | eEarlyWakeupEnd))) {
         ALOGE("Only WindowManager is allowed to use eEarlyWakeup[Start|End] flags");
@@ -4160,15 +4147,8 @@
             flags |= eTraversalNeeded;
     }
     if (what & layer_state_t::eFlagsChanged) {
-        auto changedFlags = s.flags;
-        if (changedFlags & layer_state_t::eLayerIsDisplayDecoration) {
-            if ((permissions & Permission::INTERNAL_SYSTEM_WINDOW) == 0) {
-                changedFlags &= ~layer_state_t::eLayerIsDisplayDecoration;
-                ALOGE("Attempt to use eLayerIsDisplayDecoration without permission "
-                      "INTERNAL_SYSTEM_WINDOW!");
-            }
-        }
-        if (layer->setFlags(changedFlags, s.mask)) flags |= eTraversalNeeded;
+        if (layer->setFlags(s.flags, s.mask))
+            flags |= eTraversalNeeded;
     }
     if (what & layer_state_t::eCornerRadiusChanged) {
         if (layer->setCornerRadius(s.cornerRadius))