From: http://a-pdf.com/decryption/index.htm. Batch PDF Decryption is the tool for helping you batch remove or add password protection for PDF, easily and quickly. More see: http://a-pdf.com/security/password.htm

1. Batch Remove or add password
protection for PDF

2. You may have some encrypt PDF documents. While
created password for these PDF documents, what we
want is to protect our copyright. But sometimes, we need
to reedit those PDF documents. Before editing, we need
to decrypt these encrypt PDF documents. If you are hurry
to do that, you should find a simple to use and fast way
to decrypt the standard security PDF files. Batch PDF
Decryption (A-PDF Password Security) is the tool for
helping you batch remove or add password protection for
PDF, easily and quickly.

3. Why Batch PDF Decryption?
Add or Remove the Password for Single PDF document
Batch PDF Decryption has the user-friendly interface. No matter you are a
designers or new one, you can quickly add or remove the password for single
PDF document. You can control who can open you document, who can print
your document, who can edit your document. And the properties of encrypt
PDF can be set as you need.

4. Why Batch PDF Decryption?
Batch PDF Documents Security
Some people may have multiple similar PDF documents which need to be
encrypted or decrypted. How to effectively add or remove password for
multiple PDF files? You can use the batch PDF documents security feature
which provided by Batch PDF Decryption. You can add or remove PDF files in
the same time and then save them as separate PDF files.

5. Why Batch PDF Decryption?
Monitor a Directory to encrypted PDFs
Set a monitored directory and then all files written in this directory will be
encrypted and saved to output directory.

6. Why Batch PDF Decryption?
Password Setting Rules: 40-bit RC4 encryption, which is supported by Adobe
Acrobat 3.0 or above; 128-bit RC4 encryption, which is supported by Adobe
Acrobat Reader 5.0 or above.
Except for encrypt and decryption, you can also make the PDF expired in a
certain date. When the date exceed, Adobe PDF will send the expired
information for users.

7. More see: www.a-pdf.com