Here’s a recent article of mine about the estate planning aspects of transferring copyrights to literary and artistic works. I wrote it for a readership of trusts & estates lawyers, CPAs, and financial planners who get questions about copyrights, making gifts of them during life and at death, and how the heirs of authors and artists can often terminate and reclaim a grant of rights that was made during an author’s lifetime.
You can read the whole thing, but the nugget of wisdom is this: if you intend to make a gift of literary rights when you die, do it in your will (which can be a pour-over will), and not by transferring them to your living trust while you’re alive.