- http://www.pkware.com/documents/casestudies/APPNOTE.TXT – THE document defining the pkzip file format
- https://en.wikipedia.org/wiki/PKZIP
- PKWARE is for “Phil Katz Software”
- there was a famous lawsuit between SEA and PKWARE about the source code, that pkzip was based on, as it got actually derived from shareware written by SEA
- at the time both SEA and PKWARE were small home-based companies