Well, there is iPaper.... http://www.scribd.com/ipaper
they get around this problem by using flash to view documents.

I could imagine having a nice, preservable version safely
tucked away in the archive with no access rights, and
an iPaper version for online reading. That might work.
> In practice the answer is always "no".  Anyone who can view a document
> can construct a viewer which is able to save a copy.  This has nothing
> to do with DSpace or HTTP or any document format; it's fundamental to
> the way documents are viewed.
>
> The only way around this that I can think of is to introduce a human
> monitor who watches the reader while he uses the document and forbids
> any unauthorized use, perhaps by means of a pluggable crypto gadget
> shackled to his wrist or something.  Outside of a high-security
> guarded area such as a bank's back office or a military installation,
> I don't see this as practical.
>
> A partial attempt is to present the document in PDF.  Conforming PDF
> readers are expected to obey the "no copying" and "no printing" bits
> in documents so marked.  If your reader is willing to violate the PDF
> spec., though, he can easily circumvent these markings, and there is
> open-source software out there which can easily be hacked to do this.
> Consider it equivalent in power to the spring lock on a diary, no more
> -- a reminder, not an enforcement tool
-- 
MacKenzie Smith
Associate Director for Technology
MIT Libraries


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