PDF Secure is a high performance server tool from Traction Software for Windows PC, Unix Aix, Linux, Macintosh OSX, SUN Sparc Solaris, HP-UX NOTE: This Software does NOT require Acrobat, PDF Secure is designed for server usage. PDF Secure software automates the process of password protecting pdf's, encrypting pdf's, decrypting existing pdf's, re-encrypting, changing passwords, adding permissions & changing existing permissions in pdf's. Includes Encrypt RC 40 bit and RC 128 bit support, Decrypts RC 40, RC 128 & AES