Human Tech Tree
Researched1989 · Atomic & Space Age (1945 – 1990)

Civilization / Society, Economy & Law

Open Licences (GPL, CC)

The GNU GPL (1989) and Creative Commons licences (2002) use copyright itself to guarantee that anyone may share and reuse works.

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Richard Stallman's 'copyleft' licence required modified software to stay free, which enabled Linux and much of today's software. Creative Commons applied the idea to text, images and data, and its licences are used by Wikipedia and open-access journals.

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