Adobe acrobat reader 7.0 User Manual

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About Digital Editions
Adobe Digital Editions (eBooks) are PDF files that have been packaged by the Adobe 
Content Server to protect the copyright of the author or publisher. Digital Editions are 
typically bought from online bookstores, borrowed from online lenders, or exchanged 
among users. You can also subscribe to periodicals in digital edition format. To read a 
Digital Edition, you must have a license to open and read the Digital Edition (generally 
provided by the seller or lender), you must have the full version of Adobe Reader, and you 
must activate Adobe Reader.