Marketplace
This is new, they'll use professional authenticators to verify goods before they are shipped. If the good delivered is found to be a knockoff you'll be refunded twice the purchase price. Initially will be high-end fashion gear it seems. Seller able to be part of the program (free to the buyer) or buyer can pay for authentication (free to the seller).
http://pages.ebay.com/authentication
There's also a Q&A here https://www.ebayinc.com/stories/news/ebay-to-boost-consumer-…
Very very interesting read, the cost better be affordable for buyers though.
But your avatar…err…