I'm sure you could encrypt an MDB file as easily as any other. You'd have to decrypt it to use it though. This would mean you'd either have to decrypt when your app starts and encrypt again when your app shuts down, which means your database is vulnerable for the lifetime of your process, or you would have to decrypt and re-encrypt on the fly, which would be extremely resource-intensive. I'd say your best bet would be to switch to a more secure database. There are no-cost alternatives available. MSDE offers basically the same security as SQL Server.
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