I'm trying to identify software or a service that will help me manage the PDFs that users download from my company's website. Essentially, subscribers should have access to the documents for 1 year from their subscription date or purchase date (not necessarily one year from the date they download the PDF), so I'm looking to find something that will help me accomplish this.
The best example of this in practice that I've seen is with Harvard's Publishing site. Once you purchase and download a PDF / article / case study from their site, the PDF expires and can't be opened after a set amount of time.
I've looked at a couple discussion threads on here and did a Google search. It seems like there's Adobe Document Center and Create Adobe PDF Online. I'm not sure what the differences are between the two and i'm not 100% certain yet that either of these can accomplish what I'm trying to have done. I'd appreciate any help / insights people have.
Thanks.
If security is less important, you can add JavaScript to the document to try to cause it to expire, but a sophisticated user could remove the protection and access the content anyway.