DRMed ePub is also known as "Secure Adobe ePub". These are only readable using Adobe Digital Editions, but the PRS-505 includes this software so these are readable "as is" on the Sony. The Sony must, one time only, be "authorized" to your Adobe DE account and this can only be done from a Windows PC. Once that has been done you can download ebooks (e.g. from Books on Board) from either a Windows PC or a Mac using Adobe Digital Editions.
The Sony does not include eReader software, so you can't directly read DRM infested eReader ebooks. However, the DRM can be stripped using ereader2html and the resulting HTML converted for the Sony using Calibre. Note that this may not be legal where to live.
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