Protect PDF Documents Using PDF Unshare
PDF Unshare is a free PDF protection tool that can prevent PDF documents from unauthorized sharing, taking screenshots, and opening. It does this by allowing to set expiration dates for these documents, adding watermarks and also restricting them to open on only a single device.
Download and install it from here. After it is installed, there will be two programs – PDF Unshare and UPDF Reader.
UPDF...