If you're at all unsure of what your seller's response was, I would ask for clarification. If you don't receive a clear reply regarding the legality of the CD and its contents then you've got your answer! Remember, there are an awful lot of CDs containing rare and previously unissued material (both studio and live tracks) on legitimate, legal reissue labels so you may find your suspicions are unfounded. If this is the case, the seller will generally be more than happy to give you a straight answer.