---
title: Copyleft Software Licenses
subtitle: foss-north pod
author: foss-north
license: CC-BY-SA 3.0
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# NOTES (REMOVE BEFORE PUBLISHING)
- 4 freedoms
  - The freedom to run the program as you wish, for any purpose (freedom 0).
  - The freedom to study how the program works, and change it so it does your computing as you wish (freedom 1).
  - The freedom to redistribute copies so you can help your neighbor (freedom 2).
  - The freedom to distribute copies of your modified versions to others (freedom 3). By doing this you can give the whole community to chance to benefit from your changes.
  - Source: https://en.wikipedia.org/wiki/The_Free_Software_Definition
- Distribution
  - The license is triggered by distribution.
  - Distribution is defined by the license.
  - Distribution covers both binary and source distribution.
- Variants
  - GPL - let's use Henriks pictures for the two first
  - LGPL
  - AGPL - redefined distribution to cover *-as-a-Service cases, Affero
  - GFDL - GNU Free Documentation License
- Timeline
  - GPLv1, 1989
  - GPLv2, 1991, added section 7, "Liberty or Death". Licensees can _only_ distribute GPL licensed works if they can satisfy all of the license's obligations, despite any other legal obligations.
  - LGPLv2, 1991
  - LGPLv2.1, 1999 - VAD ÄR DIFFEN MELLAN v2 och v1
  - GPLv3, 2007, covers: tivoization, drm, patents - finns som GPLv3, LGPLv3, AGPLv3
- Misc
  - Or later, GPLvN+
  - Assigning copyright to FSF
    - to allow FSF to enforce the license (only copyright holders can do this)
  - License dependency graph
    - These are (strong) copyleft licenses, they can use permissive code, but permissive code cannot use (L/A)GPL code

# Background
## FSF and the Four Freedoms
- fsf, stallman
- four freedoms
- gnu public license
- copyright assignment to fsf

# Variants
## Distribution
## The GNU Licenses
- The variants goes here
- License dependency graph

# Version History
- Timeline
- The GPLvN+