Many new titles only come with DRM (encryption). For these ebooks you need to buy Adobe PDF or Adobe ePub. Adobe PDF ebooks are sometimes just called Adobe Digital Editions, after the Adobe app that reads both PDF and ePub. You use Desktop ADE to download the ebooks (and read them on your PC/Mac if you want) and mobile ADE built into the Pocket Pro to read them there.
Books on Board is probably still the best single US source for Adobe ePub ebooks, which work better than Adobe PDF on a Pocket Pro. Note that the entire Sony store is converting to Adobe ePub by the end of the year, and at that point you will be able to buy from them and read on a Pocket Pro.
Astak says they will later on add eReader DRM support to the Pocket Pro, but it isn't a done deal yet (so I would not rely on this). If eReader is added, then many other stores become potential sources for ebooks. The Barnes & Noble ebook store sells only eReader (they own the format), and they try to compete on price with Amazon.
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