RARafert·Jul 15, 2015
You're free to re-implement the public-domain protocol[1] under your own license. Pond has a 3-clause BSD licensed Golang implementation[2] that Moxie even references in the Axolotl announcement blog post.
1: https://github.com/trevp/axolotl/wiki
2: https://github.com/agl/pond/tree/master/client/ratchet
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