It's a fear that many have. When dealing with JavaScript based apps, where all of the source code is readable (more or less), there's really no way around the p

It's a fear that many have. When dealing with JavaScript based apps, where all of the source code is readable (more or less), there's really no way around the possibility of that happening. All you can do is require that updates and support require a license key. In the end, that will be a small amount of your users. Every software company deals with this issue a little differently.