Magic PDF Locker allows you to encrypt the existing PDF documents
Edit by : Magic PDF Locker is a very easy-used and powerful Windows application, Magic PDF Locker allows you to encrypt (using standard 40-bit or 128-bit supported by Acrobat Reader 5.0 and up) the existing PDF documents, set permissions, add user and owner password. For example you can encrypt a PDF without to allow to print it. The button to print the file will be disabled in Acrobat Reader application, you can also encrypt a PDF allowing the user to read it only if he know the correct password.

Note, The source PDF must be an unencrypted PDF. Acrobat Reader will show a key in the bottom status bar if the PDF is encrypted.

There two passwords you can apply to a PDF. The first is the owner password. Opening a PDF with this password will allow you full access to the PDF when a user password has been assigned as well. This means that even if printing was disabled you will still be able to print the PDF when using this password.

Features
Its simple to use it like a Batch application to set permissions to every PDF in your archive.
Password Protect opening of the document.
Prevent copying of text/graphics.
Prevent printing of the document.
Prevent high resolution Print.
Prevent changes to the documents.
Prevent adding the annotation.
Prevent the PDF Form Filling.
Prevent the document Assembly.
Password protection for PDF documents with 40 or 128 bit encryption.
Supports user password and owner password.
Supports add printing, copying, changing, high resolution printing, annotation, PDF form filling and assembly permissions to an encrypted PDF file.
Keep the original Title, Subject, Author, Keywords and Creator information.
The rate of Encryption is very fast.
Supports PDF ver 1.0 -- 1.5 protocol.(Acrobat 1.X -- Acrobat 6.X)
Does NOT need Adobe Acrobat software.
Supports all Windows platforms, 95/98/ME/NT/2000/XP/2003.
Fully Independent; not dependent on any third party technology. you can free download Magic PDF Locker 1.4 now.