Ive no idea about the law or where you are from but i would have thought that it doesn't matter who's record collection it is, it's the advertising and handing over of money that matters. ALthough im sure many people dont stick to the law and do this sort of thing anyway.
Like i said i havent really a clue about the law but i do know that copyright laws are a tricky one. Hopefully ive bumped this up for you so you can get a proper answer.
It's a good idea though
