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+Protocol Buffers (protobuf) source is available (via svn) at:
+
+ svn checkout http://protobuf.googlecode.com/svn/trunk/ protobuf-read-only
+
+Or via git at:
+
+ https://github.com/google/protobuf
+
+This code is covered under the BSD license (see COPYING.txt). Documentation is
+available at http://code.google.com/p/protobuf.
+
+The tree's current version of the protobuf library is 2.6.1.
+
+We do not include the protobuf tests or the protoc compiler.
+
+--------------------------------------------------------------------------------
+
+# Upgrading the Protobuf Library
+
+1. Get a new protobuf release from https://github.com/google/protobuf/releases
+
+2. Run `$ ./toolkit/components/protobuf/upgrade_protobuf.sh ~/path/to/release/checkout/of/protobuf`.
+
+3. Update the moz.build to export the new set of headers and add any new .cc
+ files to the unified sources and remove old ones.