This package is a reimplementation (with extensions) of a package with the same name written by Hubert Partl in 1989 and later maintained by Robin Fairbairns.
Package source can be found below:
https://github.com/FrankMittelbach/fmitex-parskip
The license is LPPL.
Copyright (C) Frank Mittelbach (for year see .dtx file)
https://latex-project.org/
All rights reserved.