>>If you've paid for a legit copy, it's yours, and if you don't seek to profit or to deprive the original owner, then...

Hmmm. Interesting.

I have an Aardvark LP that I bought in 1970. 23/6d if I remember on the Deram label. Now I have seen it listed in a book of LP values as anything up to several hundreds of pounds (example ). If I were to sell it at whatever price am I then duty bound to return the excess profit to the band or record company?