In my opinion, if you are in doubt, you always have the moral obligation to contact the maker to make sure this full perm item is indeed intended to be used as you like.
You can argue, like many others, that when an item is full perm, the maker has lost every right to it. I do not agree
You do not know how that full perm item got spread. It could be the maker who distributed it, or it could be the former trusted partner or friend that decided to turn on the maker. Yeah, yeah, I know, I have heard all the arguments about stupidity, own fault etc
If you want to make money on other peoples work, you do have a moral obligation to find out if you can. Unless you really couldn't care one bit about right or wrong
Your own sense of morals will answer the question for you