Peachpit sells DRM-ridden and DRM-free PDFs. The Adobe Photoshop (for example) ebook is a "DRM-encrypted Adobe™ Reader™ PDF file", so this, and probably most of the ones you want, have DRM. The bad news is that this DRM has not been cracked, and so it is only readable by Adobe Reader (Windows) and Adobe Digital Editions. I don't recall seeing any reports on how well technical Adobe PDF ebooks display on the PRS-505, but no news may be good news in this case.
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