Security
Document security is similar to home security. Just as you lock your doors to prevent someone from entering your house without permission, you use security features to lock an Adobe PDF. For example, you can use passwords to restrict users from opening, printing, and editing PDFs. You can use a certificate to encrypt PDFs so that only an approved list of users can open them. If you want to save security settings for later use, you can create a security policy that stores security settings.
Note: To apply security features to PDFs, you need Adobe Acrobat
8 Professional, Acrobat 8 Standard, or Acrobat 3D Version 8.