Also, LGP compression was originally made by Square, so even if there's only new content... there would still be a small part of it that belongs to Square... but I'm just nit-picking here!
A compression method can't be copyrighted, only patented. As far as I know, LGP isn't patented.
accually software is unique in U.S patent law in that it get both a copyright and patent. yes our patent system is broken.