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Topic: Expire a PDF
Conf: (P-PDF) Developers, Msg: 53181
From: bclarke
Date: 5/29/2002 04:57 PM

Is there a way to prevent users from reading a PDF with Reader 3.x or lower (file created from Acrobat 4)?

Can you make a PDF file expire after a certain date?

The following describes my attempt in making a PDF file expire after a certain date:

I created a Javascript that expires a document once the current date meets or exceeds the expiration date contained in a field. The script is activated via a page action (OPEN) and sends you back to the first page if the document is exipred. This was done with Acrobat 4.

All worked well with Acrobat 4 and Reader 4, but did not work with Reader 3 since it does not understand Javascript. I then tried placing a field in front of the the entire page. The field covers the contents via a page action to show the field, preventing one from looking at the contents (works with Reader 3). A Javascipt hides the field when opened with Reader 4, Reader 3 cannot hide the field since the Javascript does not work.

This all worked except that when you opened the file (change security in place) with Acrobat 4 then saved it. This process makes the field hidden and the file can be read by Reader 3 afterwards. Security does not prevent one from saving over the file.....

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