[fpgaminer]

EDIT: I was wrong. Original comment:

Last I checked, encryption _is_ banned in the U.S., isn't it? So it's already the case that the government could selectively jail people for using encryption, as it sees fit.

[thethirdone]

Source? AFAIK, encryption has never been illegal in the US. Export of encryption was, but currently is in a reasonable state.

[fpgaminer]

Ah, sorry, forgot the "export" part, you're right.

According to https://en.wikipedia.org/wiki/Bernstein_v._United_States, the regulations are still in effect. It doesn't say what the U.S. loosened them to, but they do still exist.