Do Adobe PDF files expire?
No, PDFs protected by Adobe Acrobat do not expire. Though there are some third-party scripts and plugins that claim to offer expiry controls, they are typically either easily bypassed or represent a major security flaw. For more information see Adobe PDF Security Plugins.
Can you remove a PDF expiry date?
Expiry dates applied with Locklizard, however, cannot be removed. Users cannot make copies of the document via copy/paste, printing to PDF, screenshot, etc. and are unable to open their document once the expiry date has passed no matter what they do.
Can Calibre remove PDF expiry?
Yes, in fact, this is a common problem for libraries, which make use of Adobe Digital Editions. Calibre’s DeDRM plugin strips all controls from a protected PDF, including expiry, and allows the user to convert it into whatever format they like. This is basically a dream for pirates — they don’t even have to pay for an ebook to be able to share it for free on a mass scale. So, authors and publishers beware — partnering with any library that uses Adobe protection will not be good for your bottom line.
Can users open an expired PDF?
No. Once a PDF has expired it can no longer be opened.
You can, however, change the PDF expiration date on the Safeguard Admin system at any stage if you need to alter it – e.g. you need to extend the life of the document because of delays in delivering it or not updating it in time.
Are PDF expiry scripts safe?
If a PDF file expires on a date, can you change it?
Using Locklizard Safeguard, the document Publisher can change the expiry date after distribution for all users or just selected users. End users, however, cannot change the expiry date on a PDF.
How do you unlock a PDF document that has expired permissions?