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LESK is licensed under the copyleft GNU General Public License v3 (GPLv3), in order to foster a growing community with the primary goal of protecting both creators and consumers, by guaranteeing to both parties that the CORE of LESK will always remain Open-Source.

The LESK-Module package is licensed under the permissive Apache-2 License.

By licensing the LESK under GPLv3 and the LESK-Modules under the Apache 2 License, we think that a good balance can be reached to ensure that our main contribution remain open-source to both parties (creator and consumer), while allowing creators to still create proprietary and/or commercial modules, and not force them to distribute the source code or have to grant resell rights, therefore protecting their revenue stream if they wish.