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podd-slides/permissive/slides.md
Tobias Olausson aee5cc45a8 initial commit, add slides on permissive licenses
2020-05-21 18:06:04 +02:00

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title subtitle author license header-includes theme aspectratio
Permissive Software Licenses foss-north pod foss-north CC-BY-SA 3.0 \usepackage{xcolor} \definecolor{fossorange}{HTML}{ffcc33} \setbeamercolor{background canvas}{bg=black} \setbeamercolor{section in head/foot}{bg=black,fg=fossorange} \setbeamercolor{subsection in head/foot}{bg=fossorange,fg=black} \setbeamercolor{normal text}{fg=fossorange} \setbeamercolor{block title}{fg=black,bg=fossorange} \setbeamercolor{titlelike}{fg=fossorange} \setbeamercolor{itemize item}{fg=fossorange} \setbeamercolor{itemize subitem}{fg=fossorange} \setbeamerfont{caption}{size=\tiny} \setbeamerfont{footnote}{size=\tiny} \setbeamerfont{footnote mark}{size=\tiny} Malmoe 169

Background

BSD History

  • BSD was based on Research Unix by AT&T1
  • Early versions subject to AT&T license
  • Networking code first released under BSD license 1989
  • Rest of BSD rewritten to remove all AT&T code 1991

BSD History

  • AT&T sued2
  • Slowed development, helped Linux gain popularity3
  • BSD 4.4 released afterwards
    • FreeBSD, OpenBSD, NetBSD etc

MIT history

  • MIT, IBM and DEC (now HP) collaboration
    • X window system
    • Kerberos
  • Wanted to make it public domain - IBM didn't like that4
  • New license created with MIT lawyers5
  • X license and MIT license not the same but very similar

Why permissive?

  • Allows proprietary changes
  • Usually allows relicensing as proprietary
  • Easier to understand
  • Highly compatible (allow further restrictions)

FOSS license flow: CC-BY-SA 3.0 (C) 2017 David Wheeler https://dwheeler.com/essays/floss-license-slide.html{ width=50% }

BSD licenses and friends

Original BSD license

  • 4 clauses
    • Source distribution requires copyright notice
    • Binary distribution requires copyright notice in documentation
    • Advertisement material requires acknowledgement of original authors
    • May not use original authors as promotion
  • Incompatible with GPL - imposes extra restrictions

New BSD license

  • 3 clauses
  • Advertisement clause removed
  • Used by CMake, tcpdump, XMonad

Simplified BSD license

  • 2 clauses
  • Non-endorsement clause removed
  • Used by FreeBSD, OpenH264

Other BSD

:::::::::::::: {.columns} ::: {.column width="45%"}

Zero-clause BSD

  • Used by ToyBox
  • Busybox is GPL-licensed ::: ::: {.column width="45%"}

ISC license

  • Similar to BSD
  • OpenBSD ::: ::::::::::::::

MIT license

  • Also known as the Expat license
  • Very similar to the simplified BSD license
  • Used by .NET Core, Rails

Modern permissive licenses

Apache License 2.0

  • Can't relicense unmodified parts
  • Need to state what's been changed in changed files
  • Grants a license to any patent
    • OpenBSD doesn't like this6
  • Used by Kubernetes and PDF.js

Other permissive licenses

:::::: {.columns} ::: {.column width="45%"}

Satirical licenses

  • WTFPL
  • Beerware

Permissive with reservations

  • Commons clause (controversial!) ::: ::: {.column width="45%"}

Public domain-ish

  • Unlicense
  • CC-0

Zlib license

  • Zlib and libpng
  • Require license notice in source distributions
  • May not be misrepresented ::: ::::::

Mozilla Public License 2.0

  • Grants patent rights, just like Apache license

  • A weak copyleft license

    • "File-level copyleft"
    • Combined works may be proprietary
    • But original MPL licensed works must be freely available

  • Explicitly compatible with the GPLs

  • Used by Firefox, Syncthing, LibreOffice