Dappy is licenced under the GNU General Public License v3. The project originally started as a fork of Painthon, which was found on google code. Painthon was licensed GPLv2. The original goal of painthon was to mimic Microsoft paint (pre-Windows 7) albeit with some more advanced features. While Dappy has moved away from the goal of a being software clone, adding new GUI features such as context sensitive toolbars, much of the original layout remains due as it is both simple and familiar.