diff --git a/android/licenses.go b/android/licenses.go
index bcd85f9..e9e271b 100644
--- a/android/licenses.go
+++ b/android/licenses.go
@@ -308,3 +308,12 @@
 }
 
 var LicenseInfoProvider = blueprint.NewProvider(LicenseInfo{})
+
+func init() {
+	RegisterMakeVarsProvider(pctx, licensesMakeVarsProvider)
+}
+
+func licensesMakeVarsProvider(ctx MakeVarsContext) {
+	ctx.Strict("BUILD_LICENSE_METADATA",
+		ctx.Config().HostToolPath(ctx, "build_license_metadata").String())
+}
diff --git a/compliance/build_license_metadata/Android.bp b/compliance/build_license_metadata/Android.bp
new file mode 100644
index 0000000..5000346
--- /dev/null
+++ b/compliance/build_license_metadata/Android.bp
@@ -0,0 +1,29 @@
+// Copyright 2021 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+blueprint_go_binary {
+    name: "build_license_metadata",
+    srcs: [
+        "build_license_metadata.go",
+    ],
+    deps: [
+        "license_metadata_proto",
+        "golang-protobuf-proto",
+        "golang-protobuf-encoding-prototext",
+    ],
+}
diff --git a/compliance/build_license_metadata/build_license_metadata.go b/compliance/build_license_metadata/build_license_metadata.go
new file mode 100644
index 0000000..ba3cc3e
--- /dev/null
+++ b/compliance/build_license_metadata/build_license_metadata.go
@@ -0,0 +1,174 @@
+// Copyright 2021 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"google.golang.org/protobuf/encoding/prototext"
+	"google.golang.org/protobuf/proto"
+
+	"android/soong/compliance/license_metadata_proto"
+)
+
+var (
+	packageName  = flag.String("p", "", "license package name")
+	moduleType   = newMultiString("mt", "module type")
+	moduleClass  = newMultiString("mc", "module class")
+	kinds        = newMultiString("k", "license kinds")
+	conditions   = newMultiString("c", "license conditions")
+	notices      = newMultiString("n", "license notice file")
+	deps         = newMultiString("d", "license metadata file dependency")
+	sources      = newMultiString("s", "source (input) dependency")
+	built        = newMultiString("t", "built targets")
+	installed    = newMultiString("i", "installed targets")
+	roots        = newMultiString("r", "root directory of project")
+	installedMap = newMultiString("m", "map dependent targets to their installed names")
+	isContainer  = flag.Bool("is_container", false, "preserved dependent target name when given")
+	outFile      = flag.String("o", "", "output file")
+)
+
+func newMultiString(name, usage string) *multiString {
+	var f multiString
+	flag.Var(&f, name, usage)
+	return &f
+}
+
+type multiString []string
+
+func (ms *multiString) String() string     { return strings.Join(*ms, ", ") }
+func (ms *multiString) Set(s string) error { *ms = append(*ms, s); return nil }
+
+func main() {
+	flag.Parse()
+
+	metadata := license_metadata_proto.LicenseMetadata{}
+	metadata.PackageName = proto.String(*packageName)
+	metadata.ModuleTypes = *moduleType
+	metadata.ModuleClasses = *moduleClass
+	metadata.IsContainer = proto.Bool(*isContainer)
+	metadata.Projects = findGitRoots(*roots)
+	metadata.LicenseKinds = *kinds
+	metadata.LicenseConditions = *conditions
+	metadata.LicenseTexts = *notices
+	metadata.Built = *built
+	metadata.Installed = *installed
+	metadata.InstallMap = convertInstalledMap(*installedMap)
+	metadata.Sources = *sources
+	metadata.Deps = convertDependencies(*deps)
+
+	err := writeMetadata(*outFile, &metadata)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "error: %s\n", err.Error())
+		os.Exit(2)
+	}
+}
+
+func findGitRoots(dirs []string) []string {
+	ret := make([]string, len(dirs))
+	for i, dir := range dirs {
+		ret[i] = findGitRoot(dir)
+	}
+	return ret
+}
+
+// findGitRoot finds the directory at or above dir that contains a ".git" directory.  This isn't
+// guaranteed to exist, for example during remote execution, when sandboxed, when building from
+// infrastructure that doesn't use git, or when the .git directory has been removed to save space,
+// but it should be good enough for local builds.  If no .git directory is found the original value
+// is returned.
+func findGitRoot(dir string) string {
+	orig := dir
+	for dir != "" && dir != "." && dir != "/" {
+		_, err := os.Stat(filepath.Join(dir, ".git"))
+		if err == nil {
+			// Found dir/.git, return dir.
+			return dir
+		} else if !os.IsNotExist(err) {
+			// Error finding .git, return original input.
+			return orig
+		}
+		dir, _ = filepath.Split(dir)
+		dir = strings.TrimSuffix(dir, "/")
+	}
+	return orig
+}
+
+// convertInstalledMap converts a list of colon-separated from:to pairs into InstallMap proto
+// messages.
+func convertInstalledMap(installMaps []string) []*license_metadata_proto.InstallMap {
+	var ret []*license_metadata_proto.InstallMap
+
+	for _, installMap := range installMaps {
+		components := strings.Split(installMap, ":")
+		if len(components) != 2 {
+			panic(fmt.Errorf("install map entry %q contains %d colons, expected 1", len(components)-1))
+		}
+		ret = append(ret, &license_metadata_proto.InstallMap{
+			FromPath:      proto.String(components[0]),
+			ContainerPath: proto.String(components[1]),
+		})
+	}
+
+	return ret
+}
+
+// convertDependencies converts a colon-separated tuple of dependency:annotation:annotation...
+// into AnnotatedDependency proto messages.
+func convertDependencies(deps []string) []*license_metadata_proto.AnnotatedDependency {
+	var ret []*license_metadata_proto.AnnotatedDependency
+
+	for _, d := range deps {
+		components := strings.Split(d, ":")
+		dep := components[0]
+		components = components[1:]
+		ad := &license_metadata_proto.AnnotatedDependency{
+			File: proto.String(dep),
+			Annotations: make([]string, 0, len(components)),
+		}
+		for _, ann := range components {
+			if len(ann) == 0 {
+				continue
+			}
+			ad.Annotations = append(ad.Annotations, ann)
+		}
+		ret = append(ret, ad)
+	}
+
+	return ret
+}
+
+func writeMetadata(file string, metadata *license_metadata_proto.LicenseMetadata) error {
+	buf, err := prototext.MarshalOptions{Multiline: true}.Marshal(metadata)
+	if err != nil {
+		return fmt.Errorf("error marshalling textproto: %w", err)
+	}
+
+	if file != "" {
+		err = ioutil.WriteFile(file, buf, 0666)
+		if err != nil {
+			return fmt.Errorf("error writing textproto %q: %w", file, err)
+		}
+	} else {
+		_, _ = os.Stdout.Write(buf)
+	}
+
+	return nil
+}
diff --git a/compliance/license_metadata_proto/Android.bp b/compliance/license_metadata_proto/Android.bp
new file mode 100644
index 0000000..3c041e4
--- /dev/null
+++ b/compliance/license_metadata_proto/Android.bp
@@ -0,0 +1,27 @@
+// Copyright 2021 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package {
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+bootstrap_go_package {
+    name: "license_metadata_proto",
+    pkgPath: "android/soong/compliance/license_metadata_proto",
+    srcs: ["license_metadata.pb.go"],
+    deps: [
+        "golang-protobuf-reflect-protoreflect",
+        "golang-protobuf-runtime-protoimpl",
+    ],
+}
diff --git a/compliance/license_metadata_proto/license_metadata.pb.go b/compliance/license_metadata_proto/license_metadata.pb.go
new file mode 100644
index 0000000..44dbc78
--- /dev/null
+++ b/compliance/license_metadata_proto/license_metadata.pb.go
@@ -0,0 +1,451 @@
+// Copyright 2021 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.27.1
+// 	protoc        v3.19.0
+// source: license_metadata.proto
+
+package license_metadata_proto
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type LicenseMetadata struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// package_name identifies the source package. License texts are named relative to the package name.
+	PackageName   *string  `protobuf:"bytes,1,opt,name=package_name,json=packageName" json:"package_name,omitempty"`
+	ModuleTypes   []string `protobuf:"bytes,2,rep,name=module_types,json=moduleTypes" json:"module_types,omitempty"`
+	ModuleClasses []string `protobuf:"bytes,3,rep,name=module_classes,json=moduleClasses" json:"module_classes,omitempty"`
+	// projects identifies the git project(s) containing the associated source code.
+	Projects []string `protobuf:"bytes,4,rep,name=projects" json:"projects,omitempty"`
+	// license_kinds lists the kinds of licenses. e.g. SPDX-license-identifier-Apache-2.0 or legacy_notice.
+	LicenseKinds []string `protobuf:"bytes,5,rep,name=license_kinds,json=licenseKinds" json:"license_kinds,omitempty"`
+	// license_conditions lists the conditions that apply to the license kinds. e.g. notice or restricted.
+	LicenseConditions []string `protobuf:"bytes,6,rep,name=license_conditions,json=licenseConditions" json:"license_conditions,omitempty"`
+	// license_texts lists the filenames of the associated license text(s).
+	LicenseTexts []string `protobuf:"bytes,7,rep,name=license_texts,json=licenseTexts" json:"license_texts,omitempty"`
+	// is_container is true for target types that merely aggregate. e.g. .img or .zip files.
+	IsContainer *bool `protobuf:"varint,8,opt,name=is_container,json=isContainer" json:"is_container,omitempty"`
+	// built lists the built targets.
+	Built []string `protobuf:"bytes,9,rep,name=built" json:"built,omitempty"`
+	// installed lists the installed targets.
+	Installed []string `protobuf:"bytes,10,rep,name=installed" json:"installed,omitempty"`
+	// installMap identifies the substitutions to make to path names when moving into installed location.
+	InstallMap []*InstallMap `protobuf:"bytes,11,rep,name=install_map,json=installMap" json:"install_map,omitempty"`
+	// sources lists the targets depended on.
+	Sources []string `protobuf:"bytes,12,rep,name=sources" json:"sources,omitempty"`
+	// deps lists the license metadata files depended on.
+	Deps []*AnnotatedDependency `protobuf:"bytes,13,rep,name=deps" json:"deps,omitempty"`
+}
+
+func (x *LicenseMetadata) Reset() {
+	*x = LicenseMetadata{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_license_metadata_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *LicenseMetadata) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*LicenseMetadata) ProtoMessage() {}
+
+func (x *LicenseMetadata) ProtoReflect() protoreflect.Message {
+	mi := &file_license_metadata_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use LicenseMetadata.ProtoReflect.Descriptor instead.
+func (*LicenseMetadata) Descriptor() ([]byte, []int) {
+	return file_license_metadata_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *LicenseMetadata) GetPackageName() string {
+	if x != nil && x.PackageName != nil {
+		return *x.PackageName
+	}
+	return ""
+}
+
+func (x *LicenseMetadata) GetModuleTypes() []string {
+	if x != nil {
+		return x.ModuleTypes
+	}
+	return nil
+}
+
+func (x *LicenseMetadata) GetModuleClasses() []string {
+	if x != nil {
+		return x.ModuleClasses
+	}
+	return nil
+}
+
+func (x *LicenseMetadata) GetProjects() []string {
+	if x != nil {
+		return x.Projects
+	}
+	return nil
+}
+
+func (x *LicenseMetadata) GetLicenseKinds() []string {
+	if x != nil {
+		return x.LicenseKinds
+	}
+	return nil
+}
+
+func (x *LicenseMetadata) GetLicenseConditions() []string {
+	if x != nil {
+		return x.LicenseConditions
+	}
+	return nil
+}
+
+func (x *LicenseMetadata) GetLicenseTexts() []string {
+	if x != nil {
+		return x.LicenseTexts
+	}
+	return nil
+}
+
+func (x *LicenseMetadata) GetIsContainer() bool {
+	if x != nil && x.IsContainer != nil {
+		return *x.IsContainer
+	}
+	return false
+}
+
+func (x *LicenseMetadata) GetBuilt() []string {
+	if x != nil {
+		return x.Built
+	}
+	return nil
+}
+
+func (x *LicenseMetadata) GetInstalled() []string {
+	if x != nil {
+		return x.Installed
+	}
+	return nil
+}
+
+func (x *LicenseMetadata) GetInstallMap() []*InstallMap {
+	if x != nil {
+		return x.InstallMap
+	}
+	return nil
+}
+
+func (x *LicenseMetadata) GetSources() []string {
+	if x != nil {
+		return x.Sources
+	}
+	return nil
+}
+
+func (x *LicenseMetadata) GetDeps() []*AnnotatedDependency {
+	if x != nil {
+		return x.Deps
+	}
+	return nil
+}
+
+// InstallMap messages describe the mapping from an input filesystem file to the path to the file
+// in a container.
+type InstallMap struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The input path on the filesystem.
+	FromPath *string `protobuf:"bytes,1,opt,name=from_path,json=fromPath" json:"from_path,omitempty"`
+	// The path to the file inside the container or installed location.
+	ContainerPath *string `protobuf:"bytes,2,opt,name=container_path,json=containerPath" json:"container_path,omitempty"`
+}
+
+func (x *InstallMap) Reset() {
+	*x = InstallMap{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_license_metadata_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *InstallMap) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*InstallMap) ProtoMessage() {}
+
+func (x *InstallMap) ProtoReflect() protoreflect.Message {
+	mi := &file_license_metadata_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use InstallMap.ProtoReflect.Descriptor instead.
+func (*InstallMap) Descriptor() ([]byte, []int) {
+	return file_license_metadata_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *InstallMap) GetFromPath() string {
+	if x != nil && x.FromPath != nil {
+		return *x.FromPath
+	}
+	return ""
+}
+
+func (x *InstallMap) GetContainerPath() string {
+	if x != nil && x.ContainerPath != nil {
+		return *x.ContainerPath
+	}
+	return ""
+}
+
+// AnnotateDepencency messages describe edges in the build graph.
+type AnnotatedDependency struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The path to the dependency license metadata file.
+	File *string `protobuf:"bytes,1,opt,name=file" json:"file,omitempty"`
+	// The annotations attached to the dependency.
+	Annotations []string `protobuf:"bytes,2,rep,name=annotations" json:"annotations,omitempty"`
+}
+
+func (x *AnnotatedDependency) Reset() {
+	*x = AnnotatedDependency{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_license_metadata_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *AnnotatedDependency) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*AnnotatedDependency) ProtoMessage() {}
+
+func (x *AnnotatedDependency) ProtoReflect() protoreflect.Message {
+	mi := &file_license_metadata_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use AnnotatedDependency.ProtoReflect.Descriptor instead.
+func (*AnnotatedDependency) Descriptor() ([]byte, []int) {
+	return file_license_metadata_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *AnnotatedDependency) GetFile() string {
+	if x != nil && x.File != nil {
+		return *x.File
+	}
+	return ""
+}
+
+func (x *AnnotatedDependency) GetAnnotations() []string {
+	if x != nil {
+		return x.Annotations
+	}
+	return nil
+}
+
+var File_license_metadata_proto protoreflect.FileDescriptor
+
+var file_license_metadata_proto_rawDesc = []byte{
+	0x0a, 0x16, 0x6c, 0x69, 0x63, 0x65, 0x6e, 0x73, 0x65, 0x5f, 0x6d, 0x65, 0x74, 0x61, 0x64, 0x61,
+	0x74, 0x61, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x16, 0x62, 0x75, 0x69, 0x6c, 0x64, 0x5f,
+	0x6c, 0x69, 0x63, 0x65, 0x6e, 0x73, 0x65, 0x5f, 0x6d, 0x65, 0x74, 0x61, 0x64, 0x61, 0x74, 0x61,
+	0x22, 0x8a, 0x04, 0x0a, 0x0f, 0x4c, 0x69, 0x63, 0x65, 0x6e, 0x73, 0x65, 0x4d, 0x65, 0x74, 0x61,
+	0x64, 0x61, 0x74, 0x61, 0x12, 0x21, 0x0a, 0x0c, 0x70, 0x61, 0x63, 0x6b, 0x61, 0x67, 0x65, 0x5f,
+	0x6e, 0x61, 0x6d, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0b, 0x70, 0x61, 0x63, 0x6b,
+	0x61, 0x67, 0x65, 0x4e, 0x61, 0x6d, 0x65, 0x12, 0x21, 0x0a, 0x0c, 0x6d, 0x6f, 0x64, 0x75, 0x6c,
+	0x65, 0x5f, 0x74, 0x79, 0x70, 0x65, 0x73, 0x18, 0x02, 0x20, 0x03, 0x28, 0x09, 0x52, 0x0b, 0x6d,
+	0x6f, 0x64, 0x75, 0x6c, 0x65, 0x54, 0x79, 0x70, 0x65, 0x73, 0x12, 0x25, 0x0a, 0x0e, 0x6d, 0x6f,
+	0x64, 0x75, 0x6c, 0x65, 0x5f, 0x63, 0x6c, 0x61, 0x73, 0x73, 0x65, 0x73, 0x18, 0x03, 0x20, 0x03,
+	0x28, 0x09, 0x52, 0x0d, 0x6d, 0x6f, 0x64, 0x75, 0x6c, 0x65, 0x43, 0x6c, 0x61, 0x73, 0x73, 0x65,
+	0x73, 0x12, 0x1a, 0x0a, 0x08, 0x70, 0x72, 0x6f, 0x6a, 0x65, 0x63, 0x74, 0x73, 0x18, 0x04, 0x20,
+	0x03, 0x28, 0x09, 0x52, 0x08, 0x70, 0x72, 0x6f, 0x6a, 0x65, 0x63, 0x74, 0x73, 0x12, 0x23, 0x0a,
+	0x0d, 0x6c, 0x69, 0x63, 0x65, 0x6e, 0x73, 0x65, 0x5f, 0x6b, 0x69, 0x6e, 0x64, 0x73, 0x18, 0x05,
+	0x20, 0x03, 0x28, 0x09, 0x52, 0x0c, 0x6c, 0x69, 0x63, 0x65, 0x6e, 0x73, 0x65, 0x4b, 0x69, 0x6e,
+	0x64, 0x73, 0x12, 0x2d, 0x0a, 0x12, 0x6c, 0x69, 0x63, 0x65, 0x6e, 0x73, 0x65, 0x5f, 0x63, 0x6f,
+	0x6e, 0x64, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x18, 0x06, 0x20, 0x03, 0x28, 0x09, 0x52, 0x11,
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+}
+
+var (
+	file_license_metadata_proto_rawDescOnce sync.Once
+	file_license_metadata_proto_rawDescData = file_license_metadata_proto_rawDesc
+)
+
+func file_license_metadata_proto_rawDescGZIP() []byte {
+	file_license_metadata_proto_rawDescOnce.Do(func() {
+		file_license_metadata_proto_rawDescData = protoimpl.X.CompressGZIP(file_license_metadata_proto_rawDescData)
+	})
+	return file_license_metadata_proto_rawDescData
+}
+
+var file_license_metadata_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
+var file_license_metadata_proto_goTypes = []interface{}{
+	(*LicenseMetadata)(nil),     // 0: build_license_metadata.LicenseMetadata
+	(*InstallMap)(nil),          // 1: build_license_metadata.InstallMap
+	(*AnnotatedDependency)(nil), // 2: build_license_metadata.AnnotatedDependency
+}
+var file_license_metadata_proto_depIdxs = []int32{
+	1, // 0: build_license_metadata.LicenseMetadata.install_map:type_name -> build_license_metadata.InstallMap
+	2, // 1: build_license_metadata.LicenseMetadata.deps:type_name -> build_license_metadata.AnnotatedDependency
+	2, // [2:2] is the sub-list for method output_type
+	2, // [2:2] is the sub-list for method input_type
+	2, // [2:2] is the sub-list for extension type_name
+	2, // [2:2] is the sub-list for extension extendee
+	0, // [0:2] is the sub-list for field type_name
+}
+
+func init() { file_license_metadata_proto_init() }
+func file_license_metadata_proto_init() {
+	if File_license_metadata_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_license_metadata_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*LicenseMetadata); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_license_metadata_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*InstallMap); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_license_metadata_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*AnnotatedDependency); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_license_metadata_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   3,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_license_metadata_proto_goTypes,
+		DependencyIndexes: file_license_metadata_proto_depIdxs,
+		MessageInfos:      file_license_metadata_proto_msgTypes,
+	}.Build()
+	File_license_metadata_proto = out.File
+	file_license_metadata_proto_rawDesc = nil
+	file_license_metadata_proto_goTypes = nil
+	file_license_metadata_proto_depIdxs = nil
+}
diff --git a/compliance/license_metadata_proto/license_metadata.proto b/compliance/license_metadata_proto/license_metadata.proto
new file mode 100644
index 0000000..1b4f34f
--- /dev/null
+++ b/compliance/license_metadata_proto/license_metadata.proto
@@ -0,0 +1,76 @@
+// Copyright 2021 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto2";
+
+package build_license_metadata;
+option go_package = "android/soong/compliance/license_metadata_proto";
+
+message LicenseMetadata {
+  // package_name identifies the source package. License texts are named relative to the package name.
+  optional string package_name = 1;
+
+  repeated string module_types = 2;
+
+  repeated string module_classes = 3;
+
+  // projects identifies the git project(s) containing the associated source code.
+  repeated string projects = 4;
+
+  // license_kinds lists the kinds of licenses. e.g. SPDX-license-identifier-Apache-2.0 or legacy_notice.
+  repeated string license_kinds = 5;
+
+  // license_conditions lists the conditions that apply to the license kinds. e.g. notice or restricted.
+  repeated string license_conditions = 6;
+
+  // license_texts lists the filenames of the associated license text(s).
+  repeated string license_texts = 7;
+
+  // is_container is true for target types that merely aggregate. e.g. .img or .zip files.
+  optional bool is_container = 8;
+
+  // built lists the built targets.
+  repeated string built = 9;
+
+  // installed lists the installed targets.
+  repeated string installed = 10;
+
+  // installMap identifies the substitutions to make to path names when moving into installed location.
+  repeated InstallMap install_map = 11;
+
+  // sources lists the targets depended on.
+  repeated string sources = 12;
+
+  // deps lists the license metadata files depended on.
+  repeated AnnotatedDependency deps = 13;
+}
+
+// InstallMap messages describe the mapping from an input filesystem file to the path to the file
+// in a container.
+message InstallMap {
+  // The input path on the filesystem.
+  optional string from_path = 1;
+
+  // The path to the file inside the container or installed location.
+  optional string container_path = 2;
+}
+
+// AnnotateDepencency messages describe edges in the build graph.
+message AnnotatedDependency {
+  // The path to the dependency license metadata file.
+  optional string file = 1;
+
+  // The annotations attached to the dependency.
+  repeated string annotations = 2;
+}