There are several inspirations for this software that are acknowledged here.
The hash table, hash list, linked list and CONTAINER_OF macro are inspired by Linux kernel. It is believed that since ideas cannot be copyrighted, this does not make the independent implementations copyrighted by Linux kernel copyright holders.
Rebalancing of the AVL tree and the red-black tree is partially based on pseudocode obtained from Wikipedia. Mersenne Twister is based on programming ideas taken from the official implementation. SipHash is based on the official implementation under public domain. ChaCha is based on some existing implementation, but however, I am unable to find out which and do not remember anymore. MurMurHash is based on C code obtained from Wikipedia. It is believed that in most jurisdictions, these would belong to permitted citation rights and/or fair use, but commercial users of this software are advised to carefully obtain legal advice from a lawyer.
Some IP fragment reassembly code has been directly obtained from Linux kernel and DPDK. This makes them copyrighted by the original authors, as well. The same is true for the skip list based implementation of timers, obtained from DPDK, and a SHA-1 implementation, obtained from Linux kernel.