Comment by amiga386

It's not about "how things actually work", the law is there to regulate human activity. The law tends to call these copies on the wire, in RAM, in caches, etc. "transient copies", which is fine until a human starts using them as non-transient copies, e.g. saves them for later.

You could argue that your MP3 of Enjoy the Silence is actually just a big number, and you can XOR it with 0xFF and it's a completely different big number, and you just happen to XOR it with 0xFF when you want to listen to it. The courts would look past that, and instead determine if you created that "big number" by MP3-encoding the track from a CD you owned (legal), versus obtaining it from some file-sharing network (not legal)

Classic essay about techies not understanding the law: What Colour Are Your Bits? https://ansuz.sooke.bc.ca/entry/23