commit aee5cc45a89e62bc3f2e108fdf746c10146656de
Author: Tobias Olausson <tobsan@tobsan.se>
Date:   Thu May 21 18:06:04 2020 +0200

    initial commit, add slides on permissive licenses

diff --git a/README.md b/README.md
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+# Slides for foss-north podcast
+This repo contains source files for the slides we use when recording the foss-north
+podcast/screencast, starting with the series on licenses.
+
+# License
+The different slides are under different licenses depending on what license the material included in
+the slides are under. This should be marked in each slide deck somehow. In general, we try to make
+the slides available as CC-BY-SA 4.0 International
diff --git a/permissive/Makefile b/permissive/Makefile
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+all:
+	pandoc slides.md -t beamer -o permissive.pdf --slide-level=2
+ppt:
+	pandoc slides.md -o permissive.pptx --slide-level=2
+
+clean:
+	rm permissive.pdf permissive.pptx
diff --git a/permissive/license-flow.png b/permissive/license-flow.png
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diff --git a/permissive/slides.md b/permissive/slides.md
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+---
+title: Permissive Software Licenses
+subtitle: foss-north pod
+author: foss-north
+license: CC-BY-SA 3.0
+header-includes: |
+    \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}
+theme: Malmoe
+aspectratio: 169
+
+---
+
+# Background
+## BSD History
+- BSD was based on Research Unix by AT&T[^1]
+- 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
+
+[^1]: https://en.wikipedia.org/wiki/History_of_the_Berkeley_Software_Distribution
+
+## BSD History
+- AT&T sued[^AT&T]
+- Slowed development, helped Linux gain popularity[^LinuxBSD]
+- BSD 4.4 released afterwards
+    - FreeBSD, OpenBSD, NetBSD etc
+
+[^AT&T]: https://en.wikipedia.org/wiki/USL_v._BSDi
+[^LinuxBSD]: https://gondwanaland.com/meta/history/interview.html
+
+## MIT history
+- MIT, IBM and DEC (now HP) collaboration
+    - X window system
+    - Kerberos
+- Wanted to make it public domain - IBM didn't like that[^IBM]
+- New license created with MIT lawyers[^MITLawyer]
+- X license and MIT license not the same but very similar
+
+[^IBM]: https://opensource.com/article/19/4/history-mit-license
+[^MITLawyer]: https://twitter.com/JimGettys/status/1112782559937789953
+
+## 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](license-flow.png){ 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 this![^BSDCopy]
+- Used by Kubernetes and PDF.js
+
+[^BSDCopy]: http://www.openbsd.org/policy.html
+
+## 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