Today I saw a client mod which allows you to download ANY multiplayer map. Is there any plugin to block downloading? will be setting CHMOD to 750 enough? please answer! because I do not wan't that our 500x500 chunk self made (from scratch/bedrock) map will be downloaded and offered somewhere else.. thanks in advance!
No. The only way to do that I think would be if you make a client mod yourself that people have to use and make it incompatible with mods. But I think that would be kinda silly
Forcing SpoutCraft prevents this, but is a huge disadvantage because your members have to download for something they don't.
It won't 100% prevent it. SpoutCraft is open source, nothing stopping me adding map downloading to it.
Aren't there mods which notice if people are going to download or use files they aren't allowed to do so? In that case - kick/ban? I hope there is a possibility
Nope, you simply can't detect it. Frankly I could write a proxy that writes off the data while I connect with an unmodified client. nothing you can do.
If you wanted to block it nobody would be able to play on your server, all the mod does is take the info that the server is giving you in chunks and compiling it into a world folder, nothing you can do about that.