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You cannot do this with Acrobat alone. There is no special timestamp
magic. You would need a DRM solution like Adobe Policy Server, where
the users connect to the server (with a warning) each time the
document is opened, for Acrobat to check permissions.
(Bear in mind that testing the date on the computer would not be a
good solution, since the user can easily change that. And bear in mind
that you can't solve this with a script that checks and closes the
file, because the user can turn off scripting).
The best solution must be to check the permissions against a server. But the users doesn´t allways have a connection to internet. In the security tab in Acrobat i have a option for "valid to", what does this mean? How could i set a date there för all my files.
Is it possible to create a certificate that describes the security level for th PDF-files, and set a datestam there?
I don't see "valid to". What security method is selected?