PDF Unshare is a free PDF copyright protection utility that creates unshared PDF and UPDF formats to protect your PDF files from sharing, printing, editing, copying, or unauthorized access. This creative document protection tool also allows you to set an expiry date for the protected PDFs, and then all these documents would not be viewed after that date. Now entrepreneurs, book publishers, or educational institutions can easily protect their documents from unauthorized sharing to other people or publishing online with this handy application.
PDF Unshare is 100% FREE for personal / non-commercial use. Installs available for Windows (full and portable), iOS (Apple), and Android.
Source: PDF UnShare