Adobe ACROBAT 9 HOW-TOS - Making Your Documents Secure; Tracking Changes

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C H A P T E R S I X T E E N
Making Your Documents
Secure
Many of the PDF les you create on a regular basis need some sort of
protection—to prevent unauthorized access to, or manipulation of, your
les. It isn’t necessary to secure every document you create, but for those
you share or distribute, it’s a good idea.
Acrobat 9 oers several types of security. The option you choose for
your document depends on the material involved, as well as on your
intended audience:
•
Use passwords to prevent unauthorized access to documents. Restrict
opening of your document with a password, and further restrict any
types of changes with another password. You can also specify whether
to allow users to copy, print, or extract content from a document.
•
Digitally sign your document, which denes the contents of a docu-
ment at the time of signing and restricts editing of those contents. You
can identify the rst signature applied to a document as a certied
signature.
•
E-mail PDF documents and attachments securely by wrapping them in
Security Envelopes.
•
Restrict access to your document to a specic user list, based on digital
signatures, and assign dierent rights to dierent users using security
policies.
From the Library of Daniel Dadian