I'm in a predicament.... (Patreon)

I'd like to get some outside opinions on this situation I find myself in. So, people are selling my books. I have registered copyrights on these books and on the digital files it clearly states that they are not for commercial use. But of course, some people don't care, and they have them produced and sell them. I've taken down 15 different listings on AliExpress so far.

Recently a subscription box included my spell book, without my permission and without any compensation to me. They have told me that they didn't know it was mine and had ordered them from, you guessed it, AliExpress! I'm not sure how to handle that situation.

But the root of the problem is that I offer my books digitally here on Patreon. People pay the small fee to become a member, download all the books, then cancel their membership and go make illegal copies to sell. It's happening so much now I almost feel like I should take the books off of Patreon - but I don't want to do that because the vast majority of you are honest people.

Another option is to lock them until you have been a member for X amount of months. I just don't know.

Any suggestions?!