Quote:
Originally Posted by wallcraft
In most ebook stores "Adobe Digital Editions" means PDF. Powells.com makes it even more confusing by using "Adobe Digital Editions ePub" and "Adobe Digital Editions ACS4". It appears that the ACS4's are PDFs. In general, if it does not say ePub assume PDF.
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"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.