I recently bought some files and a database on CD. I pay $100 through Paypal. The seller told he got the payment, thank me and said he'll send me the cd the next day. After a while, no CD and no answer from the seller. I disputed the transaction with Paypal. They recently decided in favor of the seller because, even if it's on a CD, it is digital materials. There is also no tracking number since the seller didn't send anything. But this was also, probably, why they thought it was digital. I thought it was not since I should have received a physical CD. They decided otherwise. So now, you know to be careful with digital files on CD...