Development of Creative Commons licenses

["Claudio Ruiz G." <claudio AT derechosdigitales.org>]

Hi all.
I'm Claudio Ruiz from CC-Chile and we're going to launch our licenses in
July, 1, but in our internal discussion appeared some questions about
the licenses that we would to share with the list.

We've read the discussion about revoking the licenses of one
licensed work, and the effects seems clear, in order to the revoke won't
affect the derivative works made from a CC licensed original work. In
others words, that revoke won't have retroactive effects.
How can we determine if one derivative work was made while the initial
license was a CC one and no a copyright one, if the original author
choose the copyright system?
How to resolve that kind of troubles?

In order to identify the work and create certainty about the work and 
the license,
Is it possible to make a repository or register of the chilean works 
licensed by CC-CL?

We thought that is a real problem for the future of CC licensing system,
because is not hard to imagine troubles like this when the CC makes more
popular between artists.


Best regards,


--
Claudio Ruiz G.
Director
Corporación Derechos Digitales Chile
claudio (at) derechosdigitales.org