Literally the only thing that signify a file was from a certain program is it’s format exporters. Anything made in Max, Maya or other large tools has a bit of info added into the exported files. If you were to take those exported files and import them to blender then export it would seem like you made the files in blender and not or maya. There is nothing a company can do to trace a open file type. Therefore there is nothing they can do to stop you. But your morality should stop you. If not that, then the frightening realization that they will sue you into oblivion should.
edit, is there anyway to signal threads that are older than a certain period or does necrotic post not matter ?