Jehanne inherits a lot of code from Plan9 through Harvey.
Plan9 code is modified and redistributed under GNU General Public License, Version 2 as explained in licence/LICENSE.Plan9.txt.
Libraries that are linked to the kernel must obey to a compatible license.
New libraries and programs that use Plan9 libraries as system libraries can be subject to different licenses.
Jehanne contains a number of third-party packages under various licenses.
They are retrieved from their respective sources - licenses
for these packages are not included here, but should be available
from the respective directories in /sys/src or /pkg.