A chat about problems and benefits of the CreativeCommons Share Alike license in education.
Sorry about the totally crap levels. I had to drop off the beginning where I explain my issues with CC BY SA. Here it is here in a nutshell:

Share Alike (SA) does not work in education because:

1. Our tertiary and vocational education institution is sometimes in a
training partnership with a business or industry that may require us to mix
learning content with commercially sensitive content (such as blue prints to
machinery, patented product designs, or anything that the partner still
perceives is necessary to remain restricted in access and copy). If we were
to mix any SA content with the partner's content and redistribute (even on a
small scale) we would be expected by the SA content provider to re-release
the derivative under the SA license, but the partner would understandably
not want to do this because they percieve (rightly or wrongly) that doing so
would result in a loss of income and competative advantage. Result? We will
not mix SA content. To keep things simple, we will use SA content at all
because we will never be able to tell at what point we may find ourselves in
this position.

2. Our tertiary and vocational education institution works with a local
Maori Iwi (clan) named Ngi Tahu. At times we may be working with culturally
sensitive materials that the Ngi Tahu leaders prefer to restrict access and
copyrights to only Ngi Tahu people. We may wish to mix materials in with
that, but cannot re-release under SA because of the wishes of Ngi Tahu.
Replace the Ngi Tahu example with any minority and culturally sensative
group or individual and (rightly or wrongly doesn't matter) we have the same
situation. SA is not usable.

3. We have a large database of materials created long before CC or copyleft
existed. Photographs, video and audio of people demonstrating things. These
people signed release forms for using their image and recording for specific
purposes, and the release did not mention anything about the right for a 3rd
party to remix. We can't mix SA content with these recordings, because we
don't have the right to re-release the derivatives under anything but a C or
CC BY No Derivatives - due to the old release contracts.

This
c="http://purl.org/dc/elements/1.1/">work is licensed under a
Creative Commons Public Domain License.

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