On 4/14/2010 10:20 AM, RJack wrote:
Now, how do you cause a derivate work *that you have not yet* received
permission to create to be licensed to all third parties? Remember the
"event" must occur BEFORE permission to modify, copy and distribute is
granted. This is known as an "impossible condition" and is void. The
consequences of a void condition are construed against the drafter,
hence "promissory estoppel".

You are wrong, because you are misreading the license.

GPLv2 says <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
    2.  You may modify your copy or copies of the Program or any
    portion of it, thus forming a work based on the Program, and
    copy and distribute such modifications or work under the terms
    of Section 1 above, provided that you also meet all of these

    a) You must cause the modified files to carry prominent notices
    stating that you changed the files and the date of any change.
    b) You must cause any work that you distribute or publish, that
    in whole or in part contains or is derived from the Program or
    any part thereof, to be licensed as a whole at no charge to all
    third parties under the terms of this License.

Permission to create a derivative work requires compliance only
with section 2(a). It is the copying and distribution of the
derivative work that must also meet the conditions of 2(b).
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