Nokia a annoncé que Qt sera livré sous licence LGPL. L' annonce déclare :

Nokia today announced that its Qt cross-platform User Interface (UI) and application framework for desktop and embedded platforms will be available under the Lesser General Public License (LGPL) version 2.1 license from the release of Qt 4.5, scheduled for March 2009.

Actuellement, Qt est disponble sous une license commercial et sous license GPL