The "search across computers" feature (which is what stores your index on Google servers) is opt-in even after you've installed Google Desktop. If Joe Blow accesses Google Desktop preferences and checks the box which is clearly labelled (see below), he can't say he didn't ask for it.
Index and search my documents and viewed web pages from across all my computers.
(This feature stores your indexed files on Google Desktop servers for copying to your other computers. Learn more about this feature or our Privacy Policy.)
The option to opt-in is only available to you if you have a Google account and are signed into it, in which case it will be in your Google account preferences. It defaults to off. If you haven't registered a Google account, the search history feature isn't available for opt-in anyway.
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The option to opt-in is only available to you if you have a Google account and are signed into it, in which case it will be in your Google account preferences. It defaults to off. If you haven't registered a Google account, the search history feature isn't available for opt-in anyway.