Apple famously does this with this word soup in their SMC chips, and proceeded to bankrupt a company that sold Hackintoshes and shipped it in their EFI: https://en.wikipedia.org/wiki/Psystar_Corporation

    Our hard work
    by these words guarded
    please don't steal

    (c) Apple Computer Inc

Though one could argue that they would have probably bankrupted them anyway even if they hadn't done that.