Why is there Teeworlds and DDRace Network?

[RedMenace]

Both are technically the same but Teeworlds has better graphics and better UI.

[-Alien-]

That's a great question!

Basically there are different types of game modes in Teeworlds. DDNET focuses on the DDRace aspect of the game, which is mostly about cooperative play progressing through a puzzle map (sometimes very faily).

The DDNET client offers functionality that the normal client doesn't have. For instance a hook collision line and key bindings if you want to play on your own with a dummy (a tee which is you and you can switch between the two).

That's why the teeworlds client may have the better UI / graphics - because the DDNET client focuses mainly on the racing game mode.

[Heimdall]

I just wonder if they paid for the rights to the IP

[Pingger Shikkoken]

You might want to take a look at the license of Teeworlds ...
https://github.com/teeworlds/teeworlds/blob/master/license.txt

Originally posted by license.txt:

[...] Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
[...]

Being the Part that basically allows you to make your own Teeworlds client based on the original, provided you give proper credit and don't violate the licenses of the dependencies used in teeworlds ...

Disclaimer: This should not be seen as legal advice