can be found here. Within the user agreement.

http://pages.ebay.com/help/community/png-user.html

6.2 Restrictions. Your Information (or any items listed): (a) shall not be false, inaccurate or misleading; (b) shall not be fraudulent or involve the sale of counterfeit or stolen items; (c) shall not infringe any third party's copyright, patent, trademark, trade secret or other proprietary rights or rights of publicity or privacy; (d) shall not violate any law, statute, ordinance or regulation (including, but not limited to, those governing export control, consumer protection, unfair competition, antidiscrimination or false advertising);