The same answer fits both
The bible is the most purchased book (although the Guinness book of world records is the most COPYRIGHTED purchased book). And it is commonly believed to be the most stolen book as well, but I don't know if there's a database that can answer that.
Quit trying to make money by asking a bunch of dumb questions. I knew that money thing would ruin this site.
Wow I'm sorry, I have been informed by many differant places that the answer was bible, my apologies
Want proof? http://funadvice.com/r/14mj3pvosq1
Guinness book of world records