add expiry date to pdf using asp.net

is it possible to add an expiry date to a PDF with asp.net when someone downloads a file?

the idea is that when the user downloads a file it will be usable until a set date when it will become useless and they will have to download a f开发者_开发百科resh version.

Expire dates on PDF involve Security Certificates as there is no Expire Date on a PDF File.

You can use JS for Acrobat but no matter what you do you need to hook up with Document Server as it's the server that sends policies and check document validation/expiration when you work with PDF Files.

for what you want, I would rather do something else that use all this technology:

• is it so important to have expiration date?
• because you don't say what is the content... if's its a book related, why not just a single file?
• or a sample data of what the user might get if he/she wants the PDF...