I'm only going on my personal experience; I bought a handbag pattern a couple of years ago, and the terms and conditions of sale where that I agreed not to sell any bags that I made using the bag name. (I think it was a Buttercup bag, but can't be sure). The designer wanted a very nominal fee if people wanted to make bags to sell. I guess if you're going to use their design name and sell it as such, it's fair enough, and it was all up front.