Originally Posted by pixeloazul We use stock image sites and purchased extended license

That much could be guessed from looking at the headers (of course you source from stock image sites) and an ounce of common sense (of course you purchased some form of license).

What license(s) are they provided under for the end-user, and can you detail license(s) information for the headers themselves? Your site makes no mention of using these headers in a commercial sense. If that is not allowed, who on earth is going to buy them; how many of these headers have been sold here?