The behaviour of OAT regarding this issue is a disgrace in my opinion. They may or not be legally entitled to prevent the cds from being sold on second hand, that doesn't matter.
Its the fact that they are prepared to spend time searching out people trying to sell their products on ebay and prevent them from doing so which I find offensive. All in the name of forcing people to pay full price for their expensive products, they really will go to any lengths to maximise their profits, to the extent of quibling over one lousy cd!
It is good that you can give the cds away, i suggest that in future anyone with OAT cds that they no longer need post them on pprune for anyone to take. That would i think not be advertising for commercial gain, so would be allowed on here, plus would be one in the eye for OAT!