We have already covered PDF Tools which can encrypt, stamp and rearrange PDF files. iSafePDF is another free tool which can be used to encrypt and also add signature for PDF files. It allows you to encrypt PDF document, sign them using a certificate and timestamp the signature. All these features are PDF standards so your document will be readable/editable with all standard PDF programs.
Sign the PDF document
Encrypt the PDF file
iSafePDF is a simple and easy to use tool for PDF protection.
