I'm not an attorney (thought the wife studied law, but torts .. so different altogether) but I do know a fair amount about copyright do's and dont's. I was the photographer for North Carolina's State Educational agency and had meetings with our lawyers on this topic. What I found interesting is that different lawyers can also understand this fun stuff in slightly different ways, when it gets dow to the fine points. What's a normal person to do?
Copyright is very different from trademark and patents are different yet again. I was only ever concerned about copyright, btw.
One does not have to make ANY mark or statement to have copyright. Creating the image, text or melody grants that automatically, except in the case of work for hire. If for example one was to make a line drawing of one of my photographs, and then make a work of it without significant change then you are almost in some pretty serious trouble if I want to take the trouble to create it. However the act of creating and copying my work is not a problem I can do anything about - until you profit. It is how you use it. I can not stop editorial use. It is common and polite to ask however. As soon as you sell the work, however, you are in violation, and I can look to sue and recoup damages. In respect to photographs however I will not likely get much money - unless before the violation I have also registered the photograph. Than I can go after substantial sums - punitive damages. Fair use does not apply selling someone's copyrighted works ... but to non commercial use. I've never seen copyright used in manufactured goods. That I believe is the "trademark" area, or perhaps infringement of a patent, if there is something unique and new that is patentable in a wallet. Is there ever?
contrary to what many people think, one can take all the photos of anyone in a public setting where there is no reasonable right to privacy. That goes for minors. You can publish them in an editorial context without any consent forms. But the day you try to sell them to other than an editorializing venue service (such as a magazine, educational material or news outlet ) you may have a lot of trouble. And large companies have money for legal recourse, while that is tough on small one owner shops. If you are small, just having to show up in court is kind of a loss, right there, if it is bigger than small claims.
That is why commercial work should always have a good release, and keep in mind that a release is a contract so it must have benefits for both parties. Some releases are contracted at the venue. For example when you buy a ticket to many places. What many photographers don't know and run into as a problem is that trademarks must not be in the photograph if it is sold. Technically if one takes a photographs at a wedding and there is Micky mouse in the shot ... one should get a release from Disney, and good luck with that, getting it for no consideration. Put Mickey mouse on your wallet, where it is recognizable as THE Mikey ... now that is taunting the fates.
So yes it gets complicated and convoluted. I know what I've mentioned s is not directly related to leather-working but my basic point is that internet wisdom (my own, too) is worth mostly what you've paid for it. It helps to realize the prudence is usually the best way forward and consulting an attorney is money well spent. But so few will ever think of spending it, will they?
Asking legal advice in a forum? That is almost as amusing as internet tax advice. I mean - what could possibly go wrong, right? :D