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The add-on can eventually access external servers to notify that cards have been recognized using a particular refset (the data set used to auto-detect cards on a specific server). The cards themselves are not sent over.
Those statistics are gathered anonymously for the only purpose of informing users that a given refset has become obsolete (the Poker server changed the way the table looks so the cards are not recognized anymore).
If you use a custom built refset (created with the PokHelper Editor addon), this new refset may be sent over to external servers to be shared with other users.