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Nihil,

For scratched cds or dvds try a product called the skip doctor or dr dvd, I have no idea what it would be called on your side of the "pond".

Its a really cool device, its a buffing wheel...

Actually, under fair use you are allowed to make archival copies of programs, movies, music etc.

As long as only one copy is in use at any particular moment you haven't violated anyone's copyright...