@cgutjahr
Actually it is not that clear case.
To take example of car theft.
If you buy a car from your local cars dealer, and later point it is found out that the car you bought was actually stolen. If there was no reasonable reason for you to doubt it, you get to keep the car you bought (at least in most countries), and dispute is between the original owner and the theft, not between you and the original owner.
Similarly another case could be that for example GOG.com finds out that their Sierra games arent actually legally licensed. That the real owner suddenly appears and tells them that the deal they have about those games, was made with wrong company.
GOG would have to stop selling those sierra games unless they make a new deal with the real owner, but people who bought those games before, would (probably) still be having legal copies of it, despite that they were illegal in the first place, as there was no reason to doubt that GOG was selling real, legal copies of those games.
However, in this case because I was customer that became aware of the situation (although after already having bought it), and it wasnt after many a year, but quite instantly noticed, it is easy to reverse the situation (delete file) etc.
And because I couldnt easily enough find any contact info for Ralph Schmidt to ask him permission to keep that PPC ROM file, i deleted it.
Not sure this is true. Is the U.k. At least if you bought a car in good faith that turned out to be stolen. The car would be returned to the proper owners and you would potentially be out of pocket unless you can get the money back from the dealer.
