How to apply passwords to existing PDF files?

My MS-Access app creates about 1000 pdf files. Each file is required to have a unique password and will be emailed as attachments via a VBA procedure in Outlook 2007.    Certificates are not feasible, despite my objections. So I am looking at having to manually set the 'Open File' password for each file individually. The files are created in an Access '97 VBA procedure (by sending the results of an Access Report to the Adobe PDF Printer). Is there any way with VBA (either Access '97 or Outlook '07) to apply a unique security policy or otherwise set a unique 'Open File' password for each of the files, either as they are being created and saved - or after the fact?
I can create an Action in PRO X and manually select all the files and set the passwords. I can then encrypt and password-protect all the files at once - but they all get the same passwords - ok for 'Permissions', but not for 'Open'. Can Action fileds be modified from VBA? Or is there a way to creat an Action that can modify another Action? For example, if there is an Action named "Apply Pswd" which will apply a predefined common set of passwords to all files selected, can there be an Action, named "Apply Unique Pswd" that will update the 'Open' password field in the "Apply Common Pswd" Action as well as the name of the individual file that is to have that password? Sort of like passing parameters to a function. i.e.:
"Apply Unique Pswd":
1. Get next .pdf file from directory.
2. Get next password (whether caluclated or read from a list).
3. Open the "Apply Common Pswd" Action.
4. Change the 'Open' password and the name of the file to select (the 'Permissions' password does not change).
5. Execute the "Apply Common Password" Action - which at this time is only affecting a single file.
6. Verify the 'Open' password (or bypass the verify step, if possible).
7. Loop through all files in the directory.
   or
3.   Don't use Actions - save the .pdf file in such a way that the common 'Permissions' password and the current 'Open' password are applied to the appropriate file.
3a. Goto 7.
I have also investigated Secure Envelopes in Outlook, but again, it appeas to be a manual procedure to apply unique passwords.
I would greatly appreciate any tips, suggestions, snippits, or ideas - or enlightenment that it is just not possible to create .pdf files with passwords in VBA nor to use VBA to set the passwords post-creation.

usna73tx
I am looking for similar thing, I need to apply a password and permissions to thousands of PDF files & I do not want to open them all manually.
Did you ever find a solution?

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