I have to give credit where credit is due: most (all?) of the graphics and user interface conventions are the same as the original Windows version, and therefore copyrighted by Robert Donner and Curt Johnson, Microsoft Corporation.
All the source code, however, is (unless clearly stated otherwise) intellectual property of Roberto Virga, Carnegie Mellon University.
Please notify me if you're going to use part of the MineSweeper source and/or bytecode in your {applet, application, web page, whatever}.