We recently updated our list of various licenses and comments about them to include the Historical Permission Notice and Disclaimer(HPND). The HPND is a simple permissive license, compatible with all versions of the GPL. The HPND is actually more of a template, allowing developers to select a few options, such as whether to include a disclaimer. Variations on this license had actually been approved previously (such as the old license of Python), but it never had its own entry in the list. While at this point HPND is largely deprecated in favor of more modern lax licenses, you can still find it on some current projects, and kicking around inside some long-running projects that include code created back when it was more prevalent. As such, we wanted to include it on the list explicitly, to help clear up any confusion regarding whether this simple license was free software.