Adobe Acrobat XI - Manual (Page 360)

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Security
Last updated 1/14/2015
Specify privileged locations for trusted content
Enhanced security provides a way to specify locations for trusted content. These privileged locations can be single files,
folders, or host domains (root URLs). Content that resides in a privileged location is trusted. For example, enhanced
security normally blocks PDFs from loading data from unknown websites. If you add the data’s origin (its host domain)
to your list of privileged locations, Acrobat and Reader allow loading the data. For details, see the Enhanced Security
document at
www.adobe.com/go/learn_acr_appsecurity_en .
1 Select Preferences > Security (Enhanced).
2 Select the Enable Enhanced Security option.
3 Specify a list of locations in the Privileged Locations section, and then click OK.
• To trust any sites you already trust in Internet Explorer, select Automatically Trust Sites From My Win OS
Security Zones.
• To add only one or two PDFs from a location, click Add File.
• To create a trusted folder for multiple PDFs, click Add Folder Path or Add Host.
• To allow data to load from a website, enter the name of the root URL. For example, enter www.adobe.com, but
not www.adobe.com/products. To trust files from secure connections only, select Secure Connections Only
(https:).
Cross-domain access
Enhanced security prevents a PDF in one host domain from communicating with another domain. This action prevents
a PDF from getting malicious data from an untrusted source. When a PDF attempts cross-domain access, Acrobat and
Reader automatically attempt to load a policy file from that domain. If the domain of the document that is attempting
to access the data is included in the policy file, then the data is automatically accessible.
For more details, see the Application Security Guide at www.adobe.com/go/learn_acr_appsecurity_en .
Securing PDFs with passwords
Password security and restricting printing, editing, and copying
Note: For a full list of articles about security, see Overview of security in Acrobat and PDF content .
You can limit access to a PDF by setting passwords and by restricting certain features, such as printing and editing.
However, you cannot restrict saving copies of a PDF. The copies have the same restrictions as the original PDF. Two
types of passwords are available:
Document open password A Document Open password (also known as a user password) requires a user to type a
password to open the PDF.
Permissions password A permissions password (also known as a master password) requires a password to change
permission settings. Using a permissions password, you can restrict printing, editing, and copying content in the PDF.
Recipients don’t need a password to open the document in Reader or Acrobat. They do need a password to change the
restrictions you've set.