It also includes an 'update check' which we will use to notify people when an update is released. From a technical standpoint, it's similar to the advertising shown in the free version of Heads Up: Hold'em except we aren't using it to show ads because it is a paid app and not a free app.
However, one of the bits of information given to our server tells us if the copy is legitimate or pirated.
On the first day of release, about 30% of the update checks came from pirated copies of the game. I thought that was shocking.
However, that wasn't nearly as shocking as the fact that on the second day of release, pirated copies of the software accounted for 95% of the update checks.
For every copy of the game that is sold, 19 - 20 copies are stolen!
Chew on that for a while...