Adobe Digital Editions - how to save to another format ?

Product: Adobe Digital Editions:
OS: Windows XP Sp1

Problem: I purchase an ebook from ebooks site. I get a file ebx.etd. I open it with my acrobat professional 8.0. And it automatically launched Adobe website. After i installed Adobe Digital Editions, i open that file, and i have my ebook. But i don't know where the main pdf file ? And How to save this file to other location so as to when i re-install my windows, i can use this file. Is there any solutions to convert it to another viewable format, such as doc, or html, even pdf, that i can open it every where?
 Thanks !
thangkhobachkhoaAsked:
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Karl Heinz KremerCommented:
You cannot convert that file - that's the idea behind these ebooks: You need their viewer to read them, and they can control on which machine you can open the file. Would the distributor allow you to create a copy in a different format, they would lose that control. So there is nothing you can do to (legally) convert that file to a more accessible format.
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thangkhobachkhoaAuthor Commented:
But when i re-install windows, where i can find it? How to backup it to use later? Buy it again ??
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doannn16Commented:
@thangkhobachkhoa: No, if you buy an PDF ebook from ebooks.com, it is a DRM ebook . That is you alway and only open it in only one PC.
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bugsbeyCommented:
thangkhobachkhoa,

I would suggest trying Digital Editions 1.5 beta. It allows "cross-machine portability of DRM-protected content"

http://labs.adobe.com/technologies/digitaleditions/
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