The
Trust Center security system continually checks for external
potentially unsafe content in your workbooks. Hackers can hide Web
beacons in external content—images, linked media, data connections and
templates—to gather information about you or cause problems. When the
Trust Center detects potentially harmful external content, the Message
Bar appears with a security alert and options to enable or block the
content. Trusted publishers are reputable developers who create
application extensions, such as a macro, ActiveX control, or add-in.
The Trust Center uses a set of criteria—valid and current digital
signature, and reputable certificate—to make sure publishers’ code and
source locations are safe and secure. If you are sure that the external
content is trustworthy, you can add the content publisher and location
to your trusted lists, which allows it to run without being checked by
the Trust Center.
Modify Trusted Publishers and Locations
- 1. Click the File tab, and then click Options.
- 2. In the left pane, click Trust Center.
- 3. Click Trust Center Settings.
- 4. In the left pane, click Trusted Publishers.
- 5. Select a publisher, and then use the View and Remove buttons to make the changes you want.
- 6. In the left pane, click Trusted Locations.
- 7. Select a location, and then use the Add new location, Remove, and Modify buttons to make the changes you want.
- 8. Select or clear the Allow Trusted Locations on my network (not recommended) check box.
- 9. Select or clear the Disable all Trusted Locations check box.
- 10. Click OK.
- 11. Click OK.
