I'm doing some research on rights sales. If you're looking to sign with a publisher, you may find this useful: https://andyrossagency.wordpress.com/2009/11/09/the-book-deal-territorial-rights/
'Publishers usually try to negotiate “world rights”. This is the right to publish or license the publication of books throughout the world. Publishers will usually offer the author 50% split on the income from these rights. That is a good deal for the publisher, but not such a good deal for authors...' [cont'd in thread]