This assets is public domain.

For the purpose of contributing to a commons of creative, cultural and scientific works. 

I hereby waive all copyright and related or neighboring rights together with all associated claims and causes of action with respect to "Orc" to the extent possible under Creative Commons 1.0 Universal Licensing. 

It is permitted to incorporate in other works, reuse, build upon, modify, recreate, reproduce, display, communicate, translate, adapt, and or redistribute as freely as possible in any form whatsoever and for any purposes, including this work "Orc" (and associated collated file names) including without limitation commercial purposes.

Courtesy of GameFlats.com