After reading all the replies, I am reminded of such leather masters as Chan Geer, Jim Linnell, and George Hurst. I have had the pleasure of being around these men and seeing how they react when copies of their patterns are being used in contests or items for sale. And these folks do get copied on a regular basis and I'm not talking about patterns or projects that were sold in a book or from a paid class. To a man they are delighted that someone has used their patterns or designs in a project. These men even give folks a lot of their patterns to experiment on. Their reactions go along with the old saying "imitation is the most sincere for of flattery". One of our goals as leather crafters should be to share what we have learned with others and therefore teach by our examples.
Having said all that, I do have a problem when someone copies a pattern then claims it as their own. They should give credit where credit is due. Don't be ashamed to admit that you borrowed a pattern from this crafter or that crafter, or you used a basic pattern from whomever and added your own style to it. That shows that you had the good taste to use a proven crafter as your inspiration. If it's something that is a persons livelihood, by all mean it would be proper to ask.
Just remember, when you put something out there on the internet, it becomes fair game for anyone who wants to copy it, whether we like it or not. There are and always will be people out there without any morals at all.
Well, there's my 2 1/2 cents worth.
Sam Texas