Making PDF Content Readonly using PHP

Hi,
I have created PDF using native php class (FPDF). Can some one tell how to make the Content READONLY. User should be able to open and read the document but should not edit the content using Acrobat or any PDF editing program.

Thanks in Advance.
lwordAsked:
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AndyAelbrechtCommented:
The only thing you can do, as far as i know, is put a password on the PDF (which, as far as i know, is not possible with the FPDF or standard PDF classes given to us by PHP).

Keep in mind though, also as far as i know, the strength of PDF passwords is 40bit. Which means that on an average pc and 1 minute of googling, one could remove that password very easily.

cheers,
Andy
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