A “Key Based Key Derivation Function” is a key derivation function that uses input key material with enough entropy, possibly augmented with additional info to compute output key material.

A “Key Based Key Derivation Function” is a key derivation function or that uses input key material with enough entropy, possibly augmented with additional info to compute output key material.

You can find the definition and related information describing KBKDFs in the document: “Key Derivation using Pseudorandom Functions (SP 800-108) Validation System (KBKDFVS)”, Updated: April 23, 2013, Original: March 22, 2012, Sharon S. Keller, National Institute of Standards and Technology, Information Technology Laboratory, Computer Security Division