Two types of PDF Security Levels are:
40-bit RC4 encryption - is supported by Adobe Acrobat 3.0 or above.
128-bit RC4 encryption - is supported by Adobe Acrobat Reader 5.0 or above.

Two Types of Password are:
Open Password (User Password) - The encrypted file will require the password to open file.
Permissions Password (Owner Password) - The encrypted file will be restricted for Printing, Document Assembly, Allow Form Fill-in, Signing, Comments, Changing, Copy of content and Content Accessibility. Tool provides the options to set these permissions whether to allow or not allow.

For Example: If you want not to allow printing of PDF file, Tool provides the option to disable the Print button. If you want not to allow copy content of PDF file, simply disallow this permision through this software.

Software is easy to use
It does not need Adobe Acrobat software
Tool supports Windows 98, ME, NT, 2000, XP, 2003, Vista, Windows 7,, Windows 8 systems
It's simple to use it like a batch application to set permissions to every PDF in your archive
Password protect opening of the document
Prevent printing of the document
Prevent copying of text/graphics
Prevent changes to the document
Password protection for PDF files with 40 or 128 bit encryption
Support user password and owner password
Support add printing, copying and changing permissions to an encrypted PDF file
Lock your PDF files instantly. Stop sharing, copying and piracy