Quote:
Originally Posted by HarryT
"ACS4" is "Adobe Content Server v4", which is the current release of Adobe's DRM server. That alone, though, is no help in knowing what the format is, since ACS4 can "serve up" both ePub and PDF files.
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I agree that Powells isn't using a sensible name for these ebooks, I have no idea why they don't just say PDF. I spot checked a couple of "ACS4" titles at a search site, and they were PDFs.
As another example, Books on Board uses "Adobe Digital Editions" and "Adobe ePub". They say that "Adobe Digital Editions" might either be PDF or ePub (i.e. the publishers don't distinguish the format), but in my experience it is always PDF.