We do not collect or store any personal information. All information related to purchasing our games is handled by the third party that sells our games.
Windows / Linux:
Mac OS: The Mac App Store handles all of our sales. We do not receive any data about who makes purchases, only how many sales of each game are made. For more specific information about how Apple handles your data, please visit their site: http://www.apple.com/legal/internet-services/itunes/