The ebook is DRM-free, which BoB indicates by not including a padlock after the ebook type on its details page. In fact, any ebook you can download as an .epub without ADE is DRM-free (DRM-ridden Adobe ebooks don't start out as .epub, they only become ePubs when ADE pulls a copy from Adobe's servers).
So it should be readable on your PRS-505, but perhaps it violates some of the filesize limits that mobile ADE has. Calibre should be able to fix this for you, and I don't know why this isn't working.
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