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Now that the Signal Protocol is deployed in so many different places, is there a proper specification of the (current) protocol? (The old axolotl spec and the GPL implementation don't qualify)

What are the licensing conditions / restrictions for using the protocol?

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https://github.com/whispersystems/libsignal-protocol-c#licen...

Sorry, but an implementation is not a specification. It is not only much harder to read, but it is also a moving target. It is borderline impossible to make an independent implementation of the protocol this way.

Besides, the fact that it is licensed under the GPL might mean that somebody porting the protocol to a different platform / language might be creating a "derived work" which also must be licensed under the GPL.

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