IANAL, but...
A related issue to the one Artur raises is that many
legal systems have an
absolute right to withdraw contractual offers if they have not already been
mutually agreed upon. If you believe that a copyright license is a form of
Let's assume mutual agreement between the uploader and the commons project
(i.e. Wikimedia)
[..]
parties, even though they can't revoke it from any existing users. If a
jurisdiction allows the license to be removed from future uses (all the
The
existing user would thus be the commons project, which effectively has
been granted the license to redistribute under the same license.
So commons would act as a proxy between the original uploader and the reusers
of the content, shielding the reusers from the whims of the original
uploader.
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