I’ve heard that it is unlegal to make games in blender 2.42, because of some copyright something?. You could only use an earlier version (2.5). Is this correct? 
I think you heard wrong. Since Blender is under the GPL license, that meens that you can sell ANYTHING that you make. So you can sell games that you make.
There also has been debates on this lately at To sell, or not to sell… So check this out for more details. Or use the forum search as well.
You heard a distortion. 2.42 cannot make .exe files. 2.42a can. So, it’s impossible to export games in 2.42 (not a).
The GPL license is a little more strict than the LGPL, but it’s posted in the source code that you can use it to make a commercial game if you want, so it doesn’t matter what the GPL says. If you change the source code, your required to post the new source code, or something like that. That’s the code for Blender, not for your game. However, I don’t think sharing your source code or even your models is necessarily bad from a commercial stand point. That’s one of the reason game’s with editors tend to sell better than games that don’t have them. People like to play around with that stuff. A simple copyright notice will prevent someone else from commercial use.
I’m kind of into adventure games and I know that Lucas Arts has closed down a lot of fan sites that have use their copyrighted material. As a result, they are less known and less popular now. It was really just free advertising and publicity, but lawyers and bean counters must have rotted the company.
So I can make games without having to worry about the GPL, right?
That is correct, games are program output and therefore not covered by the GPL. The Blender team is committed to making sure that Blender can be used for both GPL and non-GPL games without any license conflicts. With stand-alone games however, any data that is included inside the actual stand-alone executable is covered by the GPL, if this is a problem then you should set up the stand-alone player so it reads from external .blend files.
see http://blender.org/cms/GPL_for_artists.495.0.html#2130
Thats why I made BlendStarter / Multi Platform Game Export Script
http://www.albartus.com/blendstarter/
Still I personally dislike the fact that you sorta have to release your game source as easy accesible games to get copyright, and when in the exe, more complex to ‘rip’ its forced into open source.
Still I personally dislike the fact that you sorta have to release your game source as easy accesible games to get copyright, and when in the exe, more complex to ‘rip’ its forced into open source.
What’s kind of too bad is that the models can’t be seperated from the source in Blender. There’s really no way to read model information into the game engine and create a scene, so exposing source code also means exposing models and artwork. The GPL wasn’t really meant to do that.
Your only requirement under the GPL is to expose your code, though. For most people that shouldn’t be a big deal at all. Make an execute and post your python scripts. Big deal.
Ok, thanks guys. I’ve just read it at some stupid tutorial somewhere…