Planet PostgreSQL – Bruce Momjian: Open Source Bait and Switch: Licensing and Beyond

Having been involved in open source for thirty years, I have seen many open source distribution methods, packaging systems, licensing options, and business models. In the early days there were only two
classes of licenses — public domain-style licenses like BSD and
MIT, and the GNU licenses. Though the GNU licenses had confusion around applications linking
to static GNU libraries, the general goals of the two licenses were well understood. The Postgres license is similar to public domain-style licenses, and is
accepted as an OSI-certified license.

As open source took over the enterprise IT infrastructure, companies formed around open source, and diverse licenses started to
proliferate. Rather than align with the previous two popular open styles, they created new licenses that were…

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