We successfully use your All-About-PDF software to create expiration dates for our system user manuals
Amma A. Adbu, Applied Computer Services Co.

All-About-PDF allows me to limit utilization of documents for a specific date. It ensures old documents are not in circulation. The expiry feature also allows us to let students have access to electronic documents.
Jean-Philippe Charron, ing. Ph.D., Polytechnique Montréal

I have found this product very useful to provide flexible levels of security and protection
Dir Prue Salter, Enhanced Learning Educational Services

I use All-About-PDF for processing research documents at the university. I think your software is excellent.
Michael G