how to decrypt a PDF

I have an encrypted PDF file that I can use on any PC by plugging in a username and password. Every time I open the file in Adobe Reader it asks for credentials, it connects to a server, checks those credentials and opens the 600 page PDf file for viewing.

It alows me to print it to a paper printer, but not to a PDf distiller. I would like to convert this file to a regular PDF and rmeove the limitations. (FYI, I have purchased PDF textbook and I'm not breaking any law by accessing the content. The encryption / authentication system however doesn't work on all devices. This encrypted PDF shows up as 600 blank pages on my iPad and my Android phone).

How can I decrypt / convert the file? I am working on a Windows 7 workstation

Thanks
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RoninoAsked:
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☠ MASQ ☠Commented:
Unfortunately I think you're going to be stuck with this.  The protection system used is to prevent copying of the document which although you have purchased you do not have a license to distribute.  You may be able to find an alternative android app that allows you to unlock and read but as the system is designed to work with Windows-based secure PDF's it's unlikely.  Although frustrating these are the Terms of Use you agreed to on buying the download.

In any event providing you with techniques that allow you to bypass the copyright owner's protection would be against the Terms of Use of this site.
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cestorCommented:
I object - my response was related to retrieving the password where the necessary copyright permissions were held.
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cestorCommented:
And in any case under us law there is provision for 'fair use' under the dmca which this would seem to fall under
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