

Ok, so, someone used an LLM do create changes. This new code is no longer under the project license it is, as you say, public domain.
Except it is, depending on code similarity. The court uses the same rules as with book plagiarism. If LLM uses exactly same code structure and only renames some variables or adds pieces of code that do nothing useful, high chances the court will declare it a derived work and enforce the license.












Military tech companies will be perfectly fine. They typically have 10+ year contracts, and military equipment has a huge price margin in exchange for being reliable and field-serviceable, and the main disadvantage of DIY radar is reliability (unless you also recruit the guy who built it into the army).
It will probably impact civilian market more, where the same companies will try to sell you an unnecessarily hardened machined aluminium box full of cheap Chinese electronics, camo painted for an additional ten thousand bucks.
Their next commercial offering might just be cheaper.