genhash is in the public domain.

The project README states the dedication in the author's own words:

    NET.HEXAPODIA.HASHTABLES

    Generic hash table implementation. This implementation is in the
    public domain.

    Written by Ingvar Mattsson <ingvar@hexapodia.net>.

The system definition in genhash.asd records the same terms:

    :licence   "Public Domain"
    :author    "Ingvar Mattsson <ingvar@hexapodia.net>"
    :maintainer "Paul Nathan <pnathan@alumni.uidaho.edu>"

This file exists so the dedication is visible at the root of the
repository. It restates the author's declaration and does not add,
remove, or alter any terms. No party claims copyright over this work.
