All Textures used in DNT are free (as in free speech).

Here are the licenses for those at the current directory.

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DNTeam GPLv3 Textures

ametista.png, carpete.png, steel1.png, steel3.png, stone2.png, 
stone_diag.png, stone.png, wood5.png

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OpenFrag and Lemog3D CC-BY Textures

burl.png, corrosive.png, gold.png, gold2.png, mosaic1.png, mosaic2.png,
steel2.png, steel3.png, stonetile.png, wood.png, wood3.png, wood6.png, 
wood7.png oldwood1.png oldwood2.png oldwood3.png

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Gimp Public Domain Textures (from patterns)

wood2.png, wood4.png

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Blender-CD Public Domain Textures

tile1_1.png, tile1_2.png, tile2.png

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wall_crete03b.png
  Author: TRaK <http://trak.mercenariesguild.net>
  License: GPLv2+, CC-BY-SAv3+
  Source: http://trak.mercenariesguild.net/node/3 (TRaK2 Texture Set)

tile3.png
  Author: Dim <http://www.brandonphoenixart.com/>
  License: CC-BYv3+
  Source: http://opengameart.org/node/8136
  Note: color-corrected by qubodup (Iwan Gabovitch) <qubodup@gmail.com>

concrete6.png
plaster3c.png
plaster3c_2.png
wood1.png1
  Author: TRaK <http://trak.mercenariesguild.net>
  License: MIT
  Source: http://trak.mercenariesguild.net/node/3 (TRaK4 Texture Set)
  
plaster2.jpg
painted1.jpg
  Author 2011: TRaK <http://trak.mercenariesguild.net>
  Author 2012: Iwan 'qubodup' Gabovitch <qubodup@gmail.com>
  Changes: layered plaster2 with painted2, changed color values, layer positions and alpha values of layers
  License: MIT
  Source: http://opengameart.org/content/grey-plastered-wall-trak-remix

wall8.jpg
  Author: TRaK <http://trak.mercenariesguild.net>
  License: GPLv2+, CC-BY-SAv3+
  Source: http://trak.mercenariesguild.net/node/3 (Babel Texture Set)

wood_agf81.png
   Author: AGF81
   License: CC-BY 3.0
   Source: http://agf81.deviantart.com/gallery/31629552?offset=0#/d2t36ow

siding2.png
   Author: Dim
   License: CC-BY 3.0
   Source: http://opengameart.org/node/8137
