All textures in this directory are licensed under GPL except :

* city_asphalt
* city_concrete
* city_checker
    which are licensed along the city track (see license file in /data/tracks/city)

* grass2
* palmtree3
* sand2
    which are licensed along island track (see license file in /data/tracks/island)
    
* dirt2sand 
* grass2dirt
* roaddirt
    which are derivated from island track textures (see license file in /data/tracks/island)
    
Credits for GPL textures :

* greenice
* ice
* snow
* snowyrock
    are taken from Extreme Tux Racer game (http://extremetuxracer.com/)

* obelisk
    is from the http://www.titusgames.de GLEST jungle set
