Any part of this implementation that is not covered by the original notice is Copyright © 2012 James Telfer, and is released under the Apache 2.0 license.
It should be noted that this algorithm was originally implemented by PKWare.
The C implementation (upon which this is based) is located within the ZLib source tree, with a copy residing as a reference within this source tree.
See the original blast.h for the terms of the license under which the C implementation was released.