Open as in free beer! – What is Open Data – Open Source licenses

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Open as in free beer! – What is Open Data – Open Source licenses

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open-licenses

A presentation about Open data and open source licenses

On Github theodorosploumis / open-licenses

Open as in free beer!

Open data and Open source licenses for developers.

Presentation by TheodorosPloumis / @theoploumis

Meetup No 28 - 18 Feb 2016 - TechMinistry.

Under Attribution 4.0 International license.

What is Open Data

  • Available to everyone
  • Free to use
  • Free to republish
  • Free to store
  • No restrictions from copyright etc
  • Free data are not necessary Open data
  • Open data does not mean unlimited usage (resources)

The 5 star open data

★ make your stuff available on the Web (whatever format) under an open license ★★ make it available as structured data (e.g., Excel instead of image scan of a table) ★★★ make it available in a non-proprietary open format (e.g., CSV as well as of Excel) ★★★★ use URIs to denote things, so that people can point at your stuff ★★★★★ link your data to other data to provide context

License is the king

  • It is the license the defines the open data.
  • A Dataset (database) may have different license from its Content.
  • Avoid Creative Commons license for Content.
  • OKFN created the opendatacommons.org.
  • ODI provides a certification for Open Data.
  • CKAN and DKAN are the leader software for open data.
  • DCAT is the RDF vocabulary to describe a Dataset.

Open Data Commons Open Database License (ODbL)

  • Free to: Share/Create/Adapt
  • As long as you: Attribute/Share Alike/Keep open

Open Data Commons Attribution License

  • Free to: Share/Create/Adapt
  • As long as you: Attribute

Open Data Commons Public Domain Dedication and License (PDDL)

  • Free to: Share/Create/Adapt
  • As long as you: -

Open Source licenses

  • License refers to the code
  • There is still a copyright holder
  • You can make money by any means except from "Royalities"
  • License is used to protect the owner from liability
  • Prefer to assign the copyright to a company not a person
  • Don't create your own license, prefer the popular and approved
  • License says how to implement it
  • Avoid the "No license", "Public Domain", "CC0"

Open Source licenses

  • Richard Stallman pushed the first official license in 1985
  • Does not apply to the trademarls or other marks
  • We can run programs with different licenses side by side
  • Brands and orgs create their (forked) license
  • How to relicense an open source project
  • Multilicensing causes trouble
  • Sometimes there are CLA and CAA
  • Using open source language does not mean open source project

Copyleft vs Non-copyleft

  • Use non-Copyleft for libraries/functions that will be used in other software
  • Copyleft: Forces to use the same license
  • Non-copyleft: Not strict and focus only on attribution
  • GPLv2 is the most popular copyleft license
  • MIT is the most popular non-copyleft license

The licenses compatibility

License compatibility between common FOSS software licenses according to David A. Wheeler (2007): the vector arrows denote an one directional compatibility, therefore better compatibility on the left side than on the right side. CC BY-SA 3.0 David A. Wheeler

GPLv2 vs GPLv3

  • OSI (v2) vs FSF + GNU (v3)
  • No compatibility
  • Projects under v2 (1991) can move to v3 (2007)
  • v2 focus on the "give back to community" concept
  • v3 focus on internationalization
  • v3 focus on DRM free products
  • v3 discourages patents and exclusive usage
  • v3 blocks "tivoization"
  • v3 is more strict
  • ASF does not really agree with the FSF for GPLv3 compatibility

Choosing an open source license

Q&A

TheodorosPloumis.com

@theoploumis

Open as in free beer! Open data and Open source licenses for developers. Presentation by TheodorosPloumis / @theoploumis Meetup No 28 - 18 Feb 2016 - TechMinistry. Under Attribution 4.0 International license.