For historical reasons, the project name Mozc has two different meanings:
In this repository, Mozc means the second definition unless otherwise noted.
Detailed differences between Google Japanese Input and Mozc are described in About Branding.
tl;dr. There is no stable version.
As described in About Branding page, Google does not promise any official QA for OSS Mozc project. Because of this, Mozc does not have a concept of Stable Release. Instead we change version number every time when we introduce non-trivial change. If you are interested in packaging Mozc source code, or developing your own products based on Mozc, feel free to pick up any version. They should be equally stable (or equally unstable) in terms of no official QA process.
Release History page may have additional information and useful links about recent changes.
All Mozc code written by Google is released under The BSD 3-Clause License. For thrid party code under src/third_party directory, see each sub directory to find the copyright notice. Note also that outside src/third_party following directories contain thrid party code.
###src/data/dictionary_oss/ Mixed. See src/data/dictionary_oss/README.txt
###src/data/test/dictionary/ The same to src/data/dictionary_oss/. See src/data/dictionary_oss/README.txt
###src/data/test/stress_test/ Public Domain. See the comment in src/data/test/stress_test/sentences.txt
###src/data/unicode/ UNICODE, INC. LICENSE AGREEMENT. See each file header for details.