It's impossible to automate checking for code license violations. If you and I write the exact same 10 lines of code, we both have independent and valid copyri

It's impossible to automate checking for code license violations. If you and I write the exact same 10 lines of code, we both have independent and valid copyrights to it. Unlike patents, independent derivation of the same code _is_ a defense for copyright. If I write 10 lines of code, publish it as GPL (but don't sign a CLA / am not assigning it to an employer), and then re-use it in an MIT codebase, I can do that because I retained copyright, and as the copyright holder I can offer the code under multiple incompatible licenses. There's no way for a machine to detect independent derivation vs copying, no way for the machine to know who the original copyright holder was in all cases, and whether I have permission from them to use it under another license (i.e. if I email the copyright holder and they say 'yeah, sure, use it under non-gpl', it suddenly becomes legal again)... It's not a problem computers can solve 100% correctly.