One important point that needs to be made, I think, is that after a legally-defined period of time ALL copyrights will eventually EXPIRE, and when the copyright expires, the original work is said to be "in the public domain," which means that a person can use those public domain works in any way they choose.
An example - someone I know very well produced the "Watchtower Book Shelf" CDs and (maybe) DVDs a number of years ago. This was popularly known as "The Watchtower BS CD" for poetic reasons. It contained PUBLIC DOMAIN Watchtower publications - early books that were never properly (according to the laws then in effect) copyrighted by the WTB&TS goofballs.
Another example is the CDs of VERY OLD Zion's Watch Tower magazines. Those original magazines are in the PUBLIC DOMAIN.
Here's an interesting thing: The ORIGINAL works are in the PUBLIC DOMAIN, but the NEW publication of those old magazines in a NEW MEDIA is under a NEW copyright -- you cannot make copies of ZWT CDs and distribute (pirate) them. If you do, you might need to hire a lawyer to defend you!
Someday in the future, those ZWT CDs will come into the PUBLIC DOMAIN, and then they can be burned into holographic crystals such as Superman has in his Library in The Fortress of Solitude. When that day comes, UADNA will be there!