I think that using FS4E would be fairly easy to defeat assuming the mod didn't actually need F4SE to function and the dependency was only a means of protection. Except most people copying mods, can't mod themselves, nor can they script... They wouldn't be able to defeat that as easily. They'd need someone that could actually mod. All you'd have to do is making it depend on F4SE functions. Set a string to the F4SE version but leave it blank, if the string is blank then the mod is rendered useless, otherwise, the mod continues to load. and F4SE is a pretty standard thing for most modders. I think it's a bit silly to have to place DRM on mods, but the fact that mods are being uploaded without permission and those uploaders claiming them as their own makes them look really bad to quite a few people, and for a reason.