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Note  Because macros can contain viruses, be careful about running them. Among the precautions you take, be sure to run up-to-date antivirus software on your computer, use digital signatures, and maintain a list of trusted sources of macros.

1. On the Tools menu, point to Macros, and then click Security.
2. In the Security dialog box, select the security level you want to use.
• To run only macros installed in trusted locations, click Very High. All other signed and unsigned macros are disabled.
• To run only macros that have been digitally signed (digitally signed: A digital signature is an electronic, encryption-based, security-enhanced stamp of authentication on a macro or document. This signature confirms that the macro or document originated from the signer and has not been altered.) and that you can confirm are from a trusted source, click High. Unsigned macros are automatically disabled, and the file is opened without any warning.
• To have a warning displayed whenever a macro is encountered from a source that is not on your list of trusted sources, click Medium. You can choose whether to enable or disable the macros when you open the file.
• If you are sure that all the files and add-ins you open are safe, click Low. Macro virus protection is turned off, and macros are always enabled when you open files (however, this setting is not recommended).

Notes

When you change the security level, you must restart Microsoft Office Visio for the changes to take effect in any add-ins (add-in: A supplemental program that adds custom commands or custom features to Microsoft Office.) or add-ons (add-on: A program that extends the Visio application through Automation references to Visio objects, methods, and properties.) that were previously loaded by Visio. For the new security changes to take effect in a document, you must close and then reopen that document.

You cannot set the security level lower than your security policy allows. For example, if your system administrator has set your security level to High, you cannot change your security level to Medium, even though you have selected Medium in this dialog box.

You can disable all macros entirely by setting your security level to Very High and disabling macros installed in trusted locations. To disable macros installed in trusted locations, click Tools, point to Macros, and then click Security. On the Trusted Publisher tab, clear the Trust all installed add-ins and templates check box. This disables all COM add-ins and third-party add-ons, as well as macros.