Operation Manual

325
Security
Last updated 4/7/2015
Reset (restore) attachment permissions
Because the list of allowed and disallowed file attachment types can grow over time, you can reset the lists to their
original state. This state can sometimes provide the highest level of security.
1 Choose Edit > Preferences (Windows) or Acrobat DC/Acrobat Reader DC > Preferences (Mac OS).
2 From the Categories on the left, select Trust Manager.
3 In the PDF Attachments panel, click Restore. The Restore button is available only if you changed the attachment
defaults.
Allow attachments to start applications
The Trust Manager lets you control whether non-PDF attachments can start their associated applications.
1 In the Preferences dialog box, select Trust Manager from the Categories on the left.
2 Select the option Allow Opening Of Non-PDF File Attachments With External Applications. You must have the
external applications to open the files.
Allow or block links to the Internet in PDFs
Note: For a full list of articles about security, see Overview of security in Acrobat and PDF content .
Clicking any link to the Internet poses a potential security risk. Malicious websites can transfer harmful content or
silently gather data. If you are concerned about these risks, you can configure Acrobat DC and Acrobat Reader DC to
display a warning when a PDF attempts to connect to an Internet site.
You can allow Acrobat DC and Acrobat Reader DC to contact selected websites by adding their addresses (URLs) to
your list of trusted websites in the Trust Manager preferences. Alternatively, you can allow all URLs.
Note: If the options in the Manage Internet Access dialog box are disabled, select Custom Setting. If options are still disabled,
your product could be under an administrator’s control with those restrictions in place.
1 Choose Edit > Preferences (Windows) or Acrobat DC/Acrobat Reader DC > Preferences (Mac OS).
2 From the Categories on the left, select Trust Manager.
3 Click Change Settings to specify the default behavior for accessing the Internet from PDFs.
4 Choose from the following options:
• To allow access to all URLs, select Allow PDF Files To Access All Web Sites.
• To restrict access to all URLs, select Block PDF Files’ Access To All Web Sites.
• To restrict access to only the URLs you specify, select Custom Setting.
• To add a website, type its URL in the Host Name text box and click Allow or Block.
• To remove a URL you no longer want to visit, select the website in the list and click Delete.
• To specify what the program should do with websites not in your custom list, select one of these options: Always
Ask, Allow Access, Block Access.
For more information, see the Application Security Guide at www.adobe.com/go/learn_acr_appsecurity_en.
Note: If you open a protected PDF and receive a prompt to allow or block a URL, select Remember My Action For This Site.
This reply adds the URL to this list.