N3D is distributed as freeware.
You are free to use N3D as part of your program for any purpose including freeware, shareware and commercial programs, provided some credit is given to the author. Credits must be given in the credits-screen of your program. If your program has no credits-screen, credits must be provided in a readme file and if available, also in the program manual/handbook.
At least one of the following credit texts must be used. If you want to include a different text, it must be first accepted by the author.
The origin of this software must not be misrepresented; you must not claim your authorship. All redistributions must retain the original copyright notice and web site addresses.
Commercial redistribution of the library is allowed only with an explicit written permission from the author.
This software is provided 'as-is', without warranty of any kind, either expressed or implied. In no event shall the author be held liable for any damages arising from the use of this software.
1.5.3