* Every map must have its own license. Once you've chosen your license, simply add the following line to the map's `.conf` file:
```lua
license = <name>
```
* If attribution is required (for example if you modify other's map and you have to tell who is author of the original map), that has to be appended to the `license` field.
If you want to tell more infomation, you can use:
```lua
others = <description>
```
* If you don't know which license to use, [this list of CC licenses](https://creativecommons.org/use-remix/cc-licenses/) can help you.
* We can only accept Free Software licenses, e.g.`CC BY-SA 4.0`.
* Please know what you are doing when choosing a certain license. For example, you can read information about various licenses and/or consult a lawyer.
Every map must have its own screenshot in map's folder. It should have an aspect ratio of 3:2 (screenshot 600x400px is suggested).
It should be named `screenshot.png`.
### `skybox` [Optional]
Six images which should be in map's folder.
*`skybox_1.png` - up
*`skybox_2.png` - down
*`skybox_3.png` - east
*`skybox_4.png` - west
*`skybox_5.png` - south
*`skybox_6.png` - north
You have to include skybox license in `license` in `.conf` file. We can only accept Free Software licenses, e.g. `CC0`, `CC BY 3.0`, `CC BY 4.0`, `CC BY-SA 3.0`, `CC BY-SA 4.0`.
You can find some good skyboxes with suitable licenses at [https://opengameart.org](https://opengameart.org/art-search-advanced?field_art_tags_tid=skybox).
## Editing exported map
The easiest way to edit exported maps is the following:
* Create a world using `singlenode` mapgen. Enable `WorldEdit` and `ctf_map` mod,
* Go in the world's folder, create a folder named `schems`, and place the `.mts` file inside,
* Start the game, `/grantme all` and enable `fly` (there is no ground in singlenode mapgen),
* Do `//1` to set the position where you will generate the map,
* Do `//mtschemplace yourschematic` (where `yourschematic` is the name of the mts file without `.mts`).
When you finish:
* Place `//1` and `//2` exactly in opposite corners of map (cube),
* Do `//mtschemcreate <new_name>` to create new edited `.mts` file. It will be saved in `schems` folder.