It'd be easier to add "this book is the property of <name>" to the head and footer of the ebook.
But as stated, anyone that accidentally misplaces their ebook reader, or has it stolen is potentially liable for serious damages .....
Seems like once again it's safer to pirate ebooks than purchase them
It's cost avoidance ... and it has twice the payback of buying the books.
Once when you don't purchases it, and secondly when you can't be sued for distributing copyright content.