All code is under the zlib License.
Textures are not under any license. Do what you want with them.
This mod adds condensed blocks. They can be condensed up to 4 times or greater. Check the config.txt for more options.
Currently, it only supports most of the solid blocks in the default modpack that Minetest comes with. If you want support for other modded blocks, please let me know. I will add it, or possibly work on some kind of API.