Re: Encrypt a file to prevent unwanted viewers?
- From: Mark Shroyer <usenet-mail@xxxxxxxxxxxxxxx>
- Date: Thu, 19 Jul 2007 19:58:11 +0000 (UTC)
On 2007-07-19, josh.dylewski@xxxxxxxxx <josh.dylewski@xxxxxxxxx> wrote:
Haha, Thanks for the reply. I don't think that would work to well,
I should of explained this better. Basically what I do is send a
proposal to a customer and I want that proposal protected. I send
probably 50 a year to people I really don't know, and that I don't
want them to have to do anything other than open the document.
They should know that it is protected, but once (if) it leave
there computer then it wont open.
Make any sense?
It seems like it is possible, once the document is opened it ties
with that computers address and only opens for that computer. That
way if he forwards it the receiver will not be able to open it.
Seems possible to me but I really don't know too much about whats
out there.
The problem is that you aren't really asking for traditional
encryption, you're asking for DRM. Like all software DRM systems,
this would be inherently circumventable: if the recipient can read
your data then he can ultimately copy it too, no matter how
difficult you try to make it for him. That's simply the way
computers work.
That said, Adobe Acrobat probably provides the closest to what
you're asking for in the form of its "encrypted PDFs", particularly
if you encrypt the document to the recipient's (Thawte, Verisign, or
whatever) signed x.509 key. Mind you, if the recipient is dedicated
enough then he or she will absolutely be able to send the file along
to somebody else (after decrypting it using GhostScript, etc.), but
not without a certain level of technical sophistication.
--
Mark Shroyer
http://markshroyer.com/
.
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