The perils of desktop tracking

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(although this is a bit of a stretch:) In the long run it may end up making things easier to secure because instead of having browsers and other applications keep track of their histories in various databases throughout your home directory then they can depend on Zeitgeist to keep track of it for them and thus you can harden your historical databases easier.
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Exactly my point. Having history at a central location and having a central tool to disable logging completely or partially should be considered as an improvement of the user security. The trick is to make the user aware of such options.