User manual

If you want to create a secure document
Acrobat provides several methods of applying security:
● Use digital signatures to indicate approval of a PDF document or form that you filled out.
(See Signing Adobe PDF documents.)
● Certify documents to disallow subsequent changes. (See Certifying documents.)
● Add passwords and set security options to restrict opening, editing, and printing PDF
documents. (See Adding passwords and setting security options.)
● Encrypt a document so that only a specified set of users have access to it. (See Encrypting
Adobe PDF files using certificates.)
● Apply server-based security policies to PDF documents. Server-based security policies are
especially useful if you want others to have access to PDF documents only for a limited
time. (See Encrypting Adobe PDF files using security policies.)
● Apply the same security settings to a number of PDF documents by creating a custom
security policy. (See Creating user security policies.)
● Add security settings to PDF attachments, and use eEnvelopes. (See Using eEnvelopes to
send secure files.)