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Qubes OS License
Qubes is a compilation of software packages, each under its own license. The compilation is made available under the GNU General Public License version 2.
The full text of the GPL v2 license can be found here.
Note on rights to double-licensing of the Qubes code
Invisible Things Lab (ITL), who has funded and run the Qubes project since the beginning, and who has contributed the majority of Qubes-specific code (specifically: core-*, gui-*, and qubes-* repositories) would like to have a right to redistribute parts of this code under proprietary licenses. This is especially important for Qubes R3 and later, where the new architecture allows the creation of many editions of Qubes, using different hypervisors, some of which might not be open source. That's why we ask every developer who contributes code to Qubes project to grant ITL permission to reuse the code under a different license, and to express this consent by including the standard signed-off line in the commit.