People just don't go around the web downloading other people databases. Mostly because the database server is not directly accesible from the outside of the network it's running into (in most of the cases). Or at least it shouldn't be. Or say it is, then you limit the IP's that can connect to it to yours only. You can fully protect database theft using some simple security utilities. Take iptables, for example. Protecting the data in the database is a totally different issue, and that's what you need to be worried about. Because data theft is possible, via various methods: input tainting, sql injection, CSRF and such.

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