[threemux]

In the US, there certainly is. The rule doesn't mention encryption specifically, it just prohibits "encoding for the purpose of obscuring meaning". The intent is what matters not the method.

[DoctorOetker]

would oblivious transfer qualify as OK? if the sender provably doesn't know what's transmitted, will the law rule it a form of obscuring meaning?

[sidewndr46]

You're thinking criminal court standards, like beyond a reasonable doubt for a conviction.

It's a procedural thing. The FCC will tell you did it & tell you the penalties. Your options are zero.

[agiacalone]

Yes, the FCC would (theoretically) just revoke your license to prevent you from doing it again if they so wanted.

[userbinator]

Do they also prohibit sarcasm?