PDF Secure

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 pdfs, encrypting pdfs, decrypting existing pdfs, re-encrypting, changing passwords, adding permissions & changing existing permissions in pdfs.
Includes Encrypt RC 40 bit and RC 128 bit support, Decrypts RC 40, RC 128 & AES

System Requirements:
Windows, AIX, Linux, Mac, Solaris

More Research:
pdf secure protect encrypt decrypt password