Sony readers (and most everything else aside from Kindle) support Adobe Adept DRM (commonly referred to as Adobe or ADE DRM).
Google Books and the Sony ebook store use Adobe DRM. Most independent ebook stores also offer their ebooks in Adobe DRM variant. I believe Kobo uses a proprietary DRM for books you download directly to a Kobo reader but the Kobo ebook store also makes their ebooks available in Adobe DRM (which you can download using your computer). As long as the ebook store has their ebooks available with Adobe DRM, you should be able to read it on your Sony and on the many other readers that support Adobe DRM (Kobo, B&N Nook, iRiver Story, etc).
Barnes and Noble has their own DRM (based on your name and credit card number) which has been included in the latest version of Adobe RMSDK. Just not sure what devices (aside from the Nook) support it, but theoretically, support for B&N DRM can be added through a firmware update.
Kindle books can only be read with Kindles or via Kindle apps or through the Kindle Cloud Reader.
iBooks can only be read on iOS devices. Not sure if you can now read them via iTunes.
Last edited by ilovejedd; 12-18-2011 at 04:10 PM.
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