protect document

Hi,
I hope I posted this thread on the right forum:

I need a suggestion on how i can protect the document that we are about to release. the doc is in a form of examination, i thought of putting it in a pdf file, but i think it also needs some expiration of some sort and a security in which it shouldn't be able to copy itself from one pc to another

any suggestion? please help

Personally I would argue that you cannot....

You could maybe release it as an executable that reads the text of the document from an encrypted resource, and displays it in its own window (as opposed to opening say a pdf with Acrobat etc). You could release individual copies/versions for each PC that it is allowed to run on, maybe tied to the MAC address or static IP address or C: volume serial number or ...

Or maybe the program could send an authorization request to a server which could check the senders IP

The possibilities are endless ! (and interesting...)

Why not zip it with a password?

[EDIT]Ignore the next paragraph[/EDIT]
Just put it on a 512-Meg and store it in a cool, dry, Internet-less place.
Yes? No?

[EDIT]
Sorry, didn't read the reqs properly

You could put the file on the Internet, then assign all your exam candidates with IDs, then require them to enter their ID to get an online version, maybe in PDF format. Once they enter their IDs and take the exam, you just invalidate anyone else who tries to use the ID.

OR, you could just gather them all into a little cramped room, and give them thin sheets of wood and carbon graphite, just like they used to do in the good ol' days
[/EDIT]

well ure post was quite small but im assuming u dont want people tampering/copying or makin profits out of your program/document, programmatcally i think its impossible people can just decompile ure code and edit it so that they can distrubute it (this is called cracking). i suggest u place a patent on it (copyright it) meaning that legally no can copy ure document or basically do ne thin except view it, this wont stop them but if u find out you can sue them .