Originally Posted by EldRick
Books bought from Sony may be in the Sony proprietary format, LRF.
calibre can convert them to EPUB for use on any reader but Kindle.
Sony readers have not used LRF for years. Indeed, recent Sony models are not even capable of reading LRF files. All books sold form the Sony store are epubs now. I just wanted to make sure that Kobo and Sony use the same DRM. For example, Barnes and Noble books cannot be used on Sony readers even though the B&N books are epubs. I would welcome a comment from someone who has used books purchased from the Sony store on their Kobo reader successfully.