Proprietary origami is the old sow that eats her own farrow.
That line is cheerfully stolen from James Joyce — farrow being an old way of saying piglets.
The two-piece pig was created by Akira Yoshizawa or Adolfo Cerceda, depending on your point-of-view, and is found in Harbin’s Secrets of Origami. The piglets are an adaptation of a traditional model by Jack Skillman, diagrammed in Randeltt’s Best of Origami. (Yes, yes, I own both books. Came by them honest, too.)
Just a call to sanity and a reminder that the best way to respect and support the work of professional origami artists is to not emulate them. If you’re an amateur origami artist, do you really need to control your work in all places and in all times? Creative Commons licensing is a better alternative to the superstition-laden copyright and will do much more to promote the art than trolling eBay for ebooks. Stop trying to nail Jell-O™ to the wall and join the party — it isn’t origami till you share it.