How can I make the program available to sell separately?
What do you mean by sell separately? Try and be explicit and clear, it’s hard to guess.
I apologize. I meant this. How can I share the code so that there is a possibility of a paid sale? I mean, I have .blend and. exe with all the data, I just left them in Google drive and now anyone can access it, and I can sell copies? I was interested in how exactly I can give access to the source code.
Sell via a marketplace such as steam or itch.io or such, and have the source without the art assets available on a repo, for an example, on github.
I understood. Thanks.
It’s interesting to me too. Although I do not plan to release games on the UPBGE engine.
If I understood this thread correctly. If my product contains code licensed under the GPL, or modified code that was under the GPL, then I must distribute the SOURCE CODE or a link to it along with my product.
But the source code of what, UPBGE Engine?
Or the original file of the UPBGE Engine with the scene of the game?
I think that only the code of the UPBGE Engine. Because whatever I do inside him, it will be done with the help of his tools, like an image or a video. I am not changing the engine code.
If I change the engine code, then I will have to post this modified code, because it will also be a GPL. And if addons are used, then the source code of the addons?
Am I getting it right? Or should I publish the original game scene file?
I wonder if it is possible to independently change the license from GPL to another closed one?
technically any python code you write for your game falls under the GPL too. But I’d argue that no, the .blend files need not be included.
But yes, UPBGE source, though if you haven’t modified the engine then just providing a link to it on the repo holding your python code should suffice.
edit: no you can not change the license, unless it’s one that provides all the protections/provisions of the GPL and then some(thus being compatible).
What you would attach a custom EULA to would be your art assets that inevitably make up the majority of your game anyways.
Without them the game won’t really be playable and while thanks to the engine and python code being open someone could try replacing the art assets and recreating the game logic via logic bricks, it’d be such a huge undertaking it’s likely not going to happen - unless you’ve long stopped supporting your game and it is in EOL status.
Then perhaps some subset of your games fans might feel incentivized to put the work in to keep the game alive. Though here I’d argue that the best solution for you at that point is to perhaps finally release the art assets to the community too if you aren’t going to be making further money from it anyways.
Worth also noting that id software used to do basically something along the lines of that with their older games: Once they stopped supporting them they released the particular version of their engine and game logic related code under GPL. But not the art assets.
It allowed the dedicated player base to keep the game playable for those with the install discs(where the art assets were located) while the GPL made it less enticing for competing studios to take the code and release a competing product to the market.
2 Likes
Is the exe file (the file that the user receives) covered by the GPL license?
Final EXE file, is it compiled?
The EXE file has different code, which is the Engine + scene settings + textures + geometry + animation. If the EXE file is a single code and is subject to the GPL license, then I have to upload it, but without animation, geometry, textures, and scene adjustment, because even the scene settings are my Intellectual property?
wiki : “A copyright gives the creator of an original work exclusive rights to it, usually for a limited time. Copyright may apply to a wide range of creative, intellectual, or artistic forms, or “works”. Copyright does not cover ideas and information themselves, only the form or manner in which they are expressed.”
Even if the GPL license forces me to publish the UPBGE file with the scene, then everything in this scene will be my intellectual property, even the name of this file? Then will I need to publish an empty UPBGE scene? 
Arguably the .blend file is blenders output so your creative work.