Three definitions of open source

Open Source as Legal Innovation: the creation of licenses that enabled source code to be open, including copy left which forced contribution of changes.1

Open Source as Collaboration Method: the process of working out in the open with a distributed group of contributors jointly making changes to a central code base.2

Open Source as Ethos: a belief that code should be open for inspection and free as in freedom. That code that runs applications should be available and changeable. That many eyes make all bugs shallow.

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