These are Adobe PDF (or possibly Adobe ePub). You can use Adobe Digital Editions to download these to your Mac and then use USB to copy them to your PRS-505.
Adobe manages its DRM via your Adobe ID account, so, as pilotbob says, if your PRS-505 is registered to your Adobe account this will work (max of 6 devices per account). If not, you need to use Windows Adobe Digital Editions just once to register your PRS-505.
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