Hi Torsten,
Unfortunately, the description you link to does not satisfy my question because 
it does not describe the full signal protocol. It is lacking, at least:

1. A description of the four-way Diffie-Hellman handshake (or any authenticated 
key exchange at all),
2. The involvement of the short-term signed pre-key in addition to the 
one-time-use pre-key.

Regards,
Nadim

________________________________________
From: Messaging <[email protected]> on behalf of Torsten Grote 
<[email protected]>
Sent: Friday, May 6, 2016 7:04:05 PM
To: [email protected]
Subject: Re: [messaging] Signal Protocol Licensing/Intellectual Property        
Status

On Friday, May 06, 2016 04:49:44 PM Nadim Kobeissi wrote:
> Are the protocols and algorithms all in public domain

According to the page [1] where the protocol was described initially, yes:

> The Double Ratchet specification (this wiki) is hereby placed in the public
> domain.

Kind Regards,
Torsten

[1] https://github.com/trevp/double_ratchet/wiki#ipr
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