This really is a huge grey area depending on when something was manufactured or drawn.
Post 1982 EVERYTHING is subject to automatic copyright.. this precedence was made due a case of artistic copying where the original artist successfully sued and won the case. PRE 1982 copyright only exists if it was individually applied for.. if it wasn't applied for, it does not exist and this applies to a lot of pinball art. Seeing as those who own rights to SOME parts of a pinball wont tell us whats subject and what isn't, we walk in grey murky waters. Now those same people may well owns rights for specific parts and in a few cases also pretend to own rights to parts.. they will also grant you permission to produce and take a fee or percentage from you for those parts/ services.. but don't be fooled, it doesn't mean that have any right to allow you anything. if the manufacturer be it GOTTLIEB or Williams hasn't said those parts can be reproduced then the agents have no rights whatsoever to grant anything, sue you for anything, send Cease and Desist letters etc.
Smoke and mirrors...