Solution

Make sure that the machine's system time, date, and time zone match the time/date/zone when you purchased the PDF or EPUB.

The error message you are getting generally occurs when one or more of your computer's system settings are incorrect. Your computer's clock time, date, and time zone need to be accurate in order for Adobe Digital Editions to work properly. We understand that you have already checked your clock on your computer. Would you please check the date and the timezone to make sure they are also accurate?

I would also recommend running the internet synchronization, which is available in a tab on the Time and Date tool in Windows.

Additional information

When you download a PDF or EPUB, the Adobe activation records timestamp information from the Adobe activation server. This information is stored inside the book. When you attempt to open the book, this information is compared to your current system information. If your system has an incorrect time/date/time zone, then the activation server disallows the request and you cannot read the book.

One of the following system settings (or a combination of them) causes this error:

• incorrect clock time
• incorrect date
• incorrect time zone

Thanks

Sanjay M Suman

Adobe System Inc.

Typical reaction?  With better, more accurate error messages, we wouldn't

get 'frustrated'.  We'd know what to do.

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Typical reaction?  With better, more accurate error messages, we wouldn't get 'frustrated'.  We'd know what to do.

Absolutely.  Even better, if the system had been properly designed, most of the issues that give obscure error messages would never have arisen at all