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! " # $ CCPP@NYU dfm dfm.io @exoplaneteer Dan Foreman-Mackey

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I don't know anything about licensing!

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but...

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I do know about data science!

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28,569,100 largest public repo ID (as of 2014-12-28)

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5,000 requests/hour rate limit

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a few requests/repo required

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1,578,967 repositories ("randomly" selected)

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6% of the GitHubz (representative)

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{ "name": "emcee", "full_name": "dfm/emcee", "language": "Python", "fork": false, "subscribers_count": 39, "forks": 117, "stargazers_count": 414, "open_issues": 35, ... } + README*, LICENSE*, COPYING* for each repository, download: in the top directory

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JavaScript Ruby Java Python PHP C C++ CSS C# Objective-C Shell Perl VimL 0 2 4 6 8 10 12 percentage of repos

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63 languages more popular than IDL (only?)

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1,578,967 repositories

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263,288 are licensed

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17% are licensed that's up from 15% in 2012! softwarefreedom.org/resources/2013/lcs-slides-aaronw

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28,972 only mention the license in the README of these,

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JavaScript Ruby Java Python PHP C C++ CSS C# Objective-C Shell Perl VimL 0 5 10 15 20 25 30 percentage with a license

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license popularity

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MIT License GPL Apache License BSD unknown LGPL Public Domain Eclipse Public License Creative Commons A↵ero GPL Mozilla Public License Artistic License ISC license 0 5 10 15 20 25 30 35 40 percentage of licensed repos all repositories

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EXCITED about licensing the internet gets really

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MIT License GPL Apache License BSD unknown LGPL Public Domain Eclipse Public License Creative Commons A↵ero GPL Mozilla Public License Artistic License ISC license 0 5 10 15 20 25 30 35 40 percentage of licensed repos all repositories

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MIT License GPL Apache License BSD unknown LGPL Public Domain Eclipse Public License Creative Commons A↵ero GPL Mozilla Public License Artistic License ISC license 0 5 10 15 20 25 30 percentage of licensed repos Python

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MIT License GPL Apache License BSD unknown LGPL Public Domain Eclipse Public License Creative Commons A↵ero GPL Mozilla Public License Artistic License ISC license 0 5 10 15 20 25 30 percentage of licensed repos IDL

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MIT License GPL Apache License BSD unknown LGPL Public Domain Eclipse Public License Creative Commons A↵ero GPL Mozilla Public License Artistic License ISC license 0 10 20 30 40 50 percentage of licensed repos C

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MIT License GPL Apache License BSD unknown LGPL Public Domain Eclipse Public License Creative Commons A↵ero GPL Mozilla Public License Artistic License ISC license 0 5 10 15 20 25 30 35 40 percentage of licensed repos Fortran

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MIT License GPL Apache License BSD unknown LGPL Public Domain Eclipse Public License Creative Commons A↵ero GPL Mozilla Public License Artistic License ISC license 0 10 20 30 40 50 60 percentage of licensed repos Emacs Lisp

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MIT License GPL Apache License BSD unknown LGPL Public Domain Eclipse Public License Creative Commons A↵ero GPL Mozilla Public License Artistic License ISC license 0 10 20 30 40 50 percentage of licensed repos VimL

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MIT License GPL Apache License BSD unknown LGPL Public Domain Eclipse Public License Creative Commons A↵ero GPL Mozilla Public License Artistic License ISC license 0 5 10 15 20 25 30 35 40 percentage of licensed repos all repositories

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MIT License GPL Apache License BSD unknown LGPL Public Domain Eclipse Public License Creative Commons A↵ero GPL Mozilla Public License Artistic License ISC license 0 10 20 30 40 50 60 percentage of licensed repos JavaScript

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MIT License GPL Apache License BSD unknown LGPL Public Domain Eclipse Public License Creative Commons A↵ero GPL Mozilla Public License Artistic License ISC license 0 10 20 30 40 50 60 70 percentage of licensed repos Ruby

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MIT License GPL Apache License BSD unknown LGPL Public Domain Eclipse Public License Creative Commons A↵ero GPL Mozilla Public License Artistic License ISC license 0 5 10 15 20 25 30 35 40 percentage of licensed repos all repositories

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MIT License GPL Apache License BSD unknown LGPL Public Domain Eclipse Public License Creative Commons A↵ero GPL Mozilla Public License Artistic License ISC license 0 10 20 30 40 50 popularity weighted percentage all repositories (weighted by popularity)

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⾠CAVEATS I only scraped GitHub

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I only found top-level license files (with the right names) ⾠CAVEATS

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my README parsing was pure hack! (it's called data science) ⾠CAVEATS

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17% of repos are licensed and the kids are permissive TAKE HOME Thanks to Aaron Williamson for the 2012 data!