COPYRIGHT - This is something that you automatically have once you write your work. When you publish your book, or agree to sell your copyright to someone else, you should know what you are selling, and it's not just the right to print a book.
@PaoloChikiamco explains the bundle of rights that you probably sold along with your copyright here:
(Also in "External Link")
BINABASA MO ANG
Publishing and Self-publishing: Advice for WritersNon-Fiction
[FILIPINO/ENGLISH] Advice for writers based on my experience self-publishing (more than 20 novels as of now) and traditional publishing (more than 10 novels with a traditional publisher, and consulting for other fellow authors). Read and learn, but...