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You can change your macro security settings without opening a database. Open Access, choose Macro on the Tools menu, and choose Security on the submenu. Access displays a Security dialog box, as shown in Figure 30-17.
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Figure 30-17. Setting your macro security level in the Security dialog box.
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Part 7: After Completing Your Application
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Securing Your Database The descriptions on the Security Level tab are misleading for Access. When you select High, Access won t let you open any database file that contains macros if the database is not signed by a trusted source. An Access desktop database or project file contains macros everywhere in the validation rules in tables, in function calls included in queries, in macro objects, and in Visual Basic code. So, unless a database contains no objects or contains only tables with no validation rules defined (the Kathy s Wedding List.mdb sample database is an example), your database contains macros. It s impossible to open an Access desktop database or project file with macros disabled, so the second sentence next to the High option in the dialog box is meaningless. Likewise, when you select the Medium option, choosing to not run potentially unsafe macros means you won t be able to open the database. You can click the Trusted Publishers tab in this dialog box to see the signatures that you ve registered on your machine or that your administrators have registered on a Windows 2000 server that is your domain controller. On this tab, you can also select the Trust all installed add-ins and templates option (selected by default). If you clear this option, none of the wizards in Access will run when you have security set to High. When you select the Medium setting (the default) and open an existing unsigned database in Access 2003, Access displays a warning dialog box, as shown in Figure 30-18. This dialog box makes it clear that you can either open the database or cancel the open.
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Figure 30-18. With macro security set to Medium, Access warns you when you open any unsigned database.
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Of course, macros cannot be disabled in an Access desktop database or project file, so it s the fact that the file is unsigned that s keeping you from opening it. When you have macro security
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Figure 30-19. Attempting to open an unsigned or untrusted database with macro security set to High.
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When you set security to High and attempt to open an unsigned database, Access displays the dialog box shown in Figure 30-19.
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Part 7: After Completing Your Application
Microsoft Office Access 2003 Inside Out set to High and you attempt to open a database that is digitally signed but the signature has not yet been trusted on your system, Access displays the dialog box shown in Figure 30-20. In the sample dialog box shown in Figure 30-20, I signed the database with a certificate that I generated on my local machine, but I hadn t trusted the publisher of the signature yet. When you see this dialog box, it might tell you that the signature has been authenticated Access was able to contact the certifying authority on the Internet and obtain a matching key for the signature. In either case, you can click the Details button to find out more about the signature. If you decide to trust the signature from this source, you can select the Always trust files from this publisher and open them automatically option, which makes the Open button available, and click the Open button to open the database. I did not digitally sign any of the sample databases they would become unsigned as soon as you changed any of the queries or sample code. If your company enforces High macro security for all workstations, you won t be able to open any of the sample databases. If you control your own macro security setting, I do not recommend that you change your macro security setting to Low unless you never open any database except ones that you create. If you have installed the JET service pack, you can leave your macro security setting at Medium and be assured that you can open most databases with very little risk. I have designed all the sample applications to run successfully in sandbox mode. You can click the Open button in the Security Warning dialog box to open and run any of the sample databases.
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