> just copyright alone wouldn't prevent you from modifying the code for personal usage.
This is correct. Copyright prevents you from distributing the protected work. It doesn't prevent you from taking it and doing whatever else you want with it.
(I'm ignoring the DMCA anti-circumvention clause here because that's a whole different issue and rarely actually comes into play)
This is correct. Copyright prevents you from distributing the protected work. It doesn't prevent you from taking it and doing whatever else you want with it.
(I'm ignoring the DMCA anti-circumvention clause here because that's a whole different issue and rarely actually comes into play)