The Trust Center security system continually checks for external potentially unsafe content in your documents. Hackers can hide Web beacons in external contentimages, linked media, data connections and templatesto 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 criteriavalid and current digital signature, and reputable certificateto 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 (New!), which allows it to run without being checked by the Trust Center. Modify Trusted Publishers and Locations
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