So the publisher is trying to get most rights to your book for your life, your kid's life, and into the old age of your great - grand kids. (deanwesleysmith.com)
There are rights agents, too, who will buy rights to a book in one place, and sell them for a higher price in another. (thebookdesigner.com)
It is essential that you understand each of these clauses — does a publisher need worldwide or digital rights to your book if they are not in a position to sell them on? (inkwellwriters.ie)