Adobe Acrobat 8 3D - Manual (Page 270)

263 ADOBE ACROBAT 3D VERSION 8
User Guide
4 Click OK if prompted to confirm your choice, and then click Close.
The directory server appears in the Security Settings dialog box.
Securing PDFs
Choosing which type of security to use
Acrobat takes advantage of the security features of Windows XP and a number of other security systems. You can
secure a PDF by using the following security methods:
Note: “Security” is sometimes confused with “accessibility,” which involves making documents easier to read for the
visually impaired.
Password encryption Add passwords and set security options to restrict opening, editing, and printing PDFs.
Certification encryption Encrypt a document so that only a specified set of users has access to it.
Certify a document Save the PDF as a certified document. Certifying a PDF adds a (visible or invisible) certifying
signature that lets the document author restrict changes to the document.
Server-based security policies Apply server-based security policies to PDFs (for example, using Adobe LiveCycle
Policy Server). Server-based security policies are especially useful if you want others to have access to PDFs for a
limited time.
Before you secure a PDF, you may want to remove any sensitive or dynamic page content that can compromise the
document’s integrity. If others will be filling in, or signing, form fields in the document, you may want to set the form
field properties to read-only to prevent modifications to the form fields.
If you want to do this: Do this:
Require a password to open a
PDF, or copy or print its contents Secure the document by choosing Password Encryption
from the Secure button in the Tasks toolbar.
If your company is signed up, you can also use Adobe
LiveCycle Policy Server to secure documents.
Indicate that you approve of the
PDF’s content Sign and certify the PDF. You must obtain a digital ID to
add digital signatures.
For Asian languages, you can add an approval stamp.
Prevent forms from being
tampered with Use LiveCycle Designer to secure forms and create
locking signature fields. See the Adobe LiveCycle
Designer Help.
Send secure file attachments via
email Use security envelopes.
Allow only the people you
specify to view a PDF Encrypt the document. Choose Certificate Encryption
from the Secure button in the Tasks toolbar, or apply
security using Adobe LiveCycle Policy Server. You must
have certificates for those who can view the documents.
If you often apply the same security settings to PDFs, consider creating a security policy to simplify your workflow.
Both Adobe LiveCycle Policy Server and certificate encryption let you save settings as a policy. If you apply security
settings to large collections of PDFs, you can automate the steps by using the Batch Processing command.