I suspect that in the near future we will see legal compatibility among copyleft licenses. For example the permission to release a derivative work originally licensed under CC-BY-SA to be released as GNU(FDL).
This will go a long way in furthering the aims of the free content movement.
It will be interesting to see how this will be achieved. Probably along the same lines as "share similarly" proposed here.
The Attribution requirement of all the Creative Commons 3.0 licenses undermines the free culture movement. A lot of people seem to ignore it in many contexts ... perhaps as it is so burdensome to keep track of the attribution trees.
In academia there is already a culture of attribution. In other contexts, attribution may not be required - e.g. kids in copy-modify-mix and share mode for fun among their friends.
Abuse of digital resources may be dealt with via legal processes other than copyright.
I'm not sure whether I'd go as far as to say that attribution undermines the free culture movement. I don't see that the ethic of recognising the building blocks of new or reconfigured knowledge is intended to undermine the free knowledge movement.
I do agree that in many contexts (cultural and otherwise) that attribution may not be required or appropriate.
Regarding Creative Commons - in the early days attribution was an option selected by the copyright holder. I understand that in 98% of the licenses users chose to require attribution and they dropped this as an optional restriction of the license.
Perhaps we should lobby for reintroducing "BY" as an optional restriction in the CC license?
While licensing is important - I think that sometimes we spend too much time grappling with the idiosyncrasies of different licenses at the expense of widening the base of libre knowledge. Licensing is a mechanism or tool to deal with the ludicrous situation of copyright insofar as knowledge is concerned. I view copyleft licenses as a clever hack to deal with the problem of copyright and focus more energy on building capacity and community to achieve a free curriculum.
I did not say "intended" to undermine it. It just does on account of the burden of managing trees of attributions.
In academia we attribute anyway even for old PD works.
The 98% is not a valid reason to drop CC-SA. So, yes, we should lobby for Attribution to be an option and reinstate CC-SA.
Right now CC-SA 3.0 is not an option (retired at 1.0), so the percentage of people using it is not likely to grow (as I believe it would).
Insisting on "BY" reinforces the notion of "IP" which has been contended in many places (e.g. here).
Keep up the good work towards a libre curriculum :-).
There is still a 1.0 version of the CC-SA license that one could theoretically use, but since that would cordon off all of that material in yet another silo where none of it could be remixed with BY-SA or GFDL material, I think that would be a big mistake. Better to simply release it into the public domain or otherwise under a "no rights reserved" license.
Thanks Steve for the comment. Agreed, it does not make sense to use the CC-SA 1.0 license - for the reasons you mention and also because it is out of date and lacks some of the requirements included in the 3.0 licenses (e.g. relating to DRM) - hence the "share similarly" approach suggested here.
Apparently, in Europe it is not legally allowable to release your work directly into the public domain. The only way for one's work to be in the PD is for its copyright to expire.
Do you know of any "no rights reserved" licenses? As far as I can see there is still a need for a license that would be more or less equivalent to PD.
This Libre License is also trying to make a stronger statement about consistency right down to the requirements for free data formats and free software for manipulating and sharing knowledge resources. It is more about a shared set of values around inclusivity: see Declaration on libre knowledge.