The evidence of infringement would be apparent when b and c were colocated and there was a utility next to them for XORing files and piping it into VLC

I didn't read it that way - the OP said "liability", after all, not "detection".

But, meh, could just be he meant "won't get caught" and not "liability"; I make mistakes in comms all the time, after all.

> Maybe, but b and c are indistinguishable from pure noise.

That's the whole point of encryption.

Right. But the copyright was violated when you used 'a' to begin with.