They literally call it "source available". From their FAQ[1]: > Q: Why don't you use the term Open Source when talking about the source code? > A: The definit

They literally call it "source available". From their FAQ[1]: > Q: Why don't you use the term Open Source when talking about the source code? > A: The definition of the term Open Source is heavily debated. The Open Source Initiative has created a definition of the term Open Source where it must be possible to commercialise the source code. The Defold Foundation has made the decision to prevent commercialisation of the game engine and editor (the Game Engine Product). We want Defold to always be free to use! (You can of course still sell your games and plugins and you can modify the engine as much as you like). [1](https://defold.com/open/ https://defold.com/open/) Their foundation charter is interesting, too: https://defold.com/foundation/ https://defold.com/foundation/