ROMs are copyrighted, correct? Well, that means it eventually expires. Especially if it was before a certain date where there was a change in the copyright law regarding ROM contents. If Apple failed to register their ROM contents before that date, they're already in the public domain. Even if they did register them, the copyright will still expire at some point (or possibly already has? [if Apple failed to file for the necessary extensions periodically under the law])

I was really surprised when I heard about the copyright law change in the 80's and that ROMs before that date needed to be registered otherwise they were in the public domain. This happened to Roland with the MT-32 ROMs. Turns out they were made before the copyright law and Roland failed to register them. As such, they are now in the public domain. We'd probably be surprised at how many ROMs from the 80's are actually in the public domain because companies failed to register their pre-copyright law ROMs according to the law. I'm sure that is the case for the Twiggy ROMs, they absolutely predate the copyright law, and I doubt Apple ever registered them, so they are in the public domain.