Sometimes we need to send someone a picture or a document only for viewing for a limited period of time and then he should return back to the creator to pay for what he has seen and quite sure it is exactly what he wants.

So, i think we really need to make an option to PDF files that we can make them valid for veiwing for a limited period of time, set a date by the file creator, and after that the file will not be accessible not even by a password.

Actually, I've found a plug-in that does that, but it has one big disadvantage...which is that when you send it to the another user who does not have the same plug-in set up on his machine, the security does not exist! and the file opens all the time!!...

I wish we can find a solution for that!...it will be very helpful in business community!