Twoplutwostore.com/Professionalpoker.com product definitions:
New = New paperback
B-Stock = Unread paperbacks that are shipping dinged distributor returns/slight printer errors that do not impact readability.
PDF= Portable Document Format developed by Adobe. These closely or exactly represent the printed book.
Tablet PDF = PDF file that is optimized for tablet PCs but is also viewable on other devices.
Epub= e-book which is better suited for some portable devices and make for a smaller file. These are constructed similar to a web site and organized by chapters. The page numbers usually do not match the printed version.
The e-books offered through twoplustwostore.com and professionalpoker.com are DRM protected by Adobe and need a reader app that supports this DRM. These apps are available for almost all devices that support DRM except Kindle. Kindle does not support Adobe DRM at the moment. The adobe reader product that supports DRM is called
Adobe Digital Editions.
The suggested app for iOS (apple) products is the
Bluefire Reader.
Highlighting and note taking is app dependent. ADE has bookmarking but I don't see highlighting/notation functions.