Attached Link: US Copyright Law, Section 109

Actually, US Copyright Law also has a section on subsequent selling of the product that CLs' EULA seems to violate:

"109(a) Notwithstanding the provisions of section 106(3), the owner of a particular copy or phonorecord lawfully made under this title, or any person authorized by such owner, is entitled, without the authority of the copyright owner, to sell or otherwise dispose of the possession of that copy or phonorecord."

Since CL is a company, and the auctions are generally run by individuals, I think that Ebay just presumes that the company knows more than the individual. Plus, the company would probably have more resources to bring a lawsuit vs the individual. However, in this case, it would seem that both CL and Ebay are wrongfully limiting the rights of consumers based off federal laws.