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a basic tenet of copyright law: Entitlement is tied to the original. Yes, you're entitled to make a copy for backup purposes or alternative use[1], but you may only use the backup/alternative while you own the original.
The showstopper in your post is when you said: "Can anyone copy Southpark? I'll do a swap or whatever!" You can't, and neither can they. If someone copies it and sends you the copy, they're breaking copyright law because you have no entitlement to the copy. If they copy it and send you the original, they're breaking copyright law because now they have no entitlement to the copy.
Sure, you could argue that that's their problem, but that's why I locked the thread -- not to restrict right to reply but to negate the possibility of someone opening themselves, you or particularly me up to legal liability created by copyright infringement or encouragement to infringe.
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[1]Although again, I don't think this has been tested in Irish law, so it's possible you're not really entitled to do even that.