The United States judicial system has already established the precedent that the use of encryption is a requirement to protect free speech in the digital era, and the same ideas should be applied to Bitcoin in every corner of the world that prides itself on the freedom of its citizens. Here is a 1999 ruling by the United States Court of Appeals, Ninth Circuit (Bernstein v. United States), confirming that encryption, like math, is an expression of scientific ideas and therefore a form of speech:
Cryptographers use source code to express their scientific ideas in much the same way that mathematicians use equations or economists use graphs. Of course, both mathematical equations and graphs are used in other fields for many purposes, not all of which are expressive. But mathematicians and economists have adopted these modes of expression in order to facilitate the precise and rigorous expression of complex scientific ideas. Similarly, the undisputed record here makes it clear that cryptographers utilize source code in the same fashion. In light of these considerations, we conclude that encryption software, in its source code form and as employed by those in the field of cryptography, must be viewed as expressive for First Amendment purposes.
Source: Nik Bhatia: Layered Money