Development of Creative Commons licenses

[Anthony <osm AT inbox.org>]

On Mon, Aug 27, 2012 at 12:02 PM, Gregor Hagedorn
<g.m.hagedorn AT gmail.com> wrote:
> Since the licensors of a large fraction of CC BY-SA licensed works
> cannot be contacted (what is the percentage of Wikipedia articles for
> which ALL contributors can effectively be contacted?) and since this
> fraction will drastically increase over time (what is the percentage
> of Wikipedia authors from 2002 that are still active?), I think this
> is undesirable.
>
> License violations may well be unintended and in good faith. When
> re-using Wikipedia-articles, parts of which have been copied from
> other pages (with source page cited in the edit comment), it can be
> very difficult to safely enumerate all authors.

Forget reusers.  If the WMF itself violates CC-BY-SA, the license
terminates automatically.  Any user who wants to be difficult can then
demand that all their contributions be permanently removed.  WMF can't
cure the error by fixing the violation.