Strictly speaking, for proprietary relicensing 'only' unconditional permissions are needed.

Signed-off-by: enyst <engel.nyst@gmail.com>
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enyst 2014-09-05 13:55:28 -04:00 committed by Bradley M. Kuhn
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@ -4322,10 +4322,11 @@ versions, and those forks that exist remain freely available.
A final common business model that is perhaps the most controversial is
proprietary relicensing of a GPL'd code base. This is only an option for
software in which a particular entity is the sole copyright holder. As
discussed earlier in this tutorial, a copyright holder is permitted under
copyright law to license a software system under her copyright as many
different ways as she likes to as many different parties as she wishes.
software in which a particular entity is the sole copyright holder or has
unconditional relicensing permissions. As discussed earlier in this tutorial,
a copyright holder is permitted under copyright law to license a software
system under her copyright as many different ways as she likes to as many
different parties as she wishes.
Some companies use this to their
financial advantage with regard to a GPL'd code base. The standard