My point was that encrypting a copyrighted work does not remove the copyright from it; the result is still copyright and not legally redistributable.
I think the topic is “evidence of infringement is no longer readily available” not “suddenly, there is no infringement!”
Maybe, but b and c are indistinguishable from pure noise.
I think the topic is “evidence of infringement is no longer readily available” not “suddenly, there is no infringement!”