> but the problem is that they have used a third-party library where they cannot legally release https://github.com/id-Software/DOOM https://github.com/id-Sof

> but the problem is that they have used a third-party library where they cannot legally release https://github.com/id-Software/DOOM https://github.com/id-Software/DOOM The DOOM source code was released without sound support due to this: > The bad news: this code only compiles and runs on linux. We couldn't release the dos code because of a copyrighted sound library we used (wow, was that a mistake -- I write my own sound code now), and I honestly don't even know what happened to the port that microsoft did to windows. This isn't always a true dichotomy. Any code is better than none, you don't have to release all of it to make a difference (especially if the closed-source library is provided as a shared object). The code could be provided in a non-functionning state, it would already be a lot more helpful than binary patching while relying on disassemblers. A closed-source library can be worked around (stripping functionality), replaced, re-implemented, linked against a blob, reverse-engineered, etc.