iStonsoft PDF Encryption 2.1.41 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The following versions: 2.1 and 1.0 are the most frequently downloaded ones by the program users.
The software lies within Office Tools, more precisely Document management. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. IStonsoft PDF Encryption.exe and PDF_ENCRYPTION.exe are the most common filenames for this program's installer. This program was originally developed by iStonsoft.
From the developer:
iStonsoft PDF Encryption is a program that allows you to easily encrypt PDF files with User and Owner Passwords. The program has support for 40 bit RC4, 128 bit RC4 and 128 bit AES encryption systems. You can add Owner Password to PDF documents to protect them from reuse and set the User Password to prevent PDF files from opened directly.
You may want to check out more software, such as iStonsoft PDF to ePub Converter, iStonsoft PDF Converter or iStonsoft PDF Password Remover, which might be related to iStonsoft PDF Encryption.
E-book Tools
Office Tools