[Commons-l] [cc-licenses] [Foundation-l] Requirements for a strong copyleft license

[Gregory Maxwell]

On Dec 3, 2007 12:59 PM, drew Roberts <zotz at 100jamz.com> wrote:
> OK, CC BY is not copyleft at all.
>
> CC BY-SA as it stands now is a weak copyleft (as we are speaking of weak here)

This is, however, a disputed point: CC-By-SA even includes examples of
new works which would be required to be cc-by-sa licensed, such as the
movie which results from adding images or video to a covered sound
recording.