"Share similarly" wording

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Does it need to be copyleft / ShareAlike? - I think not. How best to reword?

Trying "Libre share".
KTucker (talk)02:34, 27 October 2009

The wording in CC-BY-SA is:

"If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one".

I was under the impression (on account of something I read by David Wiley a long time ago) that CC ShareAlike meant one would have to release derived works under exactly the same license. The above wording does not say that. So, I am assuming that "similar license" means 'similar in intent'. In this case, the new license would have to retain the 4 freedoms and require them in derived works.

KTucker (talk)23:24, 19 April 2011