As I understand it (and I might be wrong), there are basically two types
of open source projects regarding copyright and Contributor Agreement.

The first type are projects where contributors hold exclusive copyright
on their contributions. These projects often does not require
contributors to sign CA, and project owner could not change the license
for the project without permission from every contributor. Linux is a
notable example of this type.

The second type are projects where contributors transfer or share
copyright with project owner. This requires contributors to sign CA and
allows project owner to redistribute code including your contributions
under a different license (proprietary or open source). Clojure is the
second type.

--
Mikhail

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