Encrypt - Decrypt PDF Description:

Encrypt & Decrypt PDF allows you to Encrypt and Decrypt protected Adobe Acrobat PDF files in batch mode. With this software, you may freely secure your PDF files from being printed, changed, copied, extracted, signed, filled, assembled and/or merged, and you also may remove the password of your PDF files, if you already know the owner or user password. All versions of Adobe Acrobat are supported.

Features:
Does NOT need Adobe Acrobat software;
Encrypt & decrypt PDF files in batch;
Supports PDF 1.5;
Supports Adobe Standard 40-bit encryption and Adobe Advanced 128-bit encryption;
Password protect opening of the document;
Prevent printing of the document;
Prevent copying of text/graphics;
Prevent changes to the document;
Prevent changes to form fields and annotations;
Supports add printing, copying and changing permissions to an encrypted PDF file;
Supports user password and owner password;
Reduce the actual size of PDF files by compressing text and graphics(Compress PDFs);
The rate of encryption is very fast;
Windows 98, ME, NT, 2000, XP and 2003 supported.