Code:

The mod this is based on was licensed under GPLv3 and can be found in the 0.3
branch and at https://forum.minetest.net/viewtopic.php?t=658.
License of the embedded nyancat mod (see nyancat/license.txt):
SPDX-License-Identifier: LGPL-2.1-or-later
License of my changes:
SPDX-License-Identifier: MIT



Textures:

SPDX-License-Identifier: CC-BY-SA-3.0
See nyancat/license.txt for the authors of the nyancat_* textures.



Sounds:


nyanland_cat.*.ogg:

The meow sounds are based on files from freesound.org, from various authors:
CC by 3.0:
— http://www.freesound.org/people/dobroide/sounds/95698/
— http://www.freesound.org/people/Kyster/sounds/79114/
— http://www.freesound.org/people/Kyster/sounds/82275/
Sampling Plus 1.0:
— http://www.freesound.org/people/oliver%20eye/sounds/56380/

At the time of this writing, the freesound.org website does not work,
which hinders an association of the sound files in this mod to the above links.
Listening to the meow sounds and associating them is left as a task for the
reader. A pull request documenting the result of this task here is welcome.


nyanland_portal.*.ogg:

The portal sounds are made from audio captcha generated at freenode.net for IRC.
Their license is unknown.


nyanland_cloud_footstep.*.ogg:

The footstep sounds are edited versions of the gravel sounds in the default of
minetest_game.
Their license is unknown.