I wanted to build a license system into my Minecraft plug-in (but generally also into other programs, etc.) and wanted to ask whether this is even possible? It would be ideal that I have e.g. A certain file with a certain content on a web server and only if it exists can the plugin be used. Not a problem in itself, but you could decompile the plugin, remove the lines with the license system and compile again… Any suggestions for a solution?
You can't have one hundred percent protection against this with Java. Obfuscators can help, but they can't hide your inquiries from the Internet either, they can be easily redirected. I can recommend you simply not to use such a system, it is unnecessary and can be bypassed anyway.
