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In an announcement in late November of last year, Creative Commons announced the release of version 4 of Creative Commons licencing. Arriving after a development period of two years, version four is billed as “the most global, legally robust licenses produced by CC to date.”
It should come as no surprise that I support the work done by the Creative Commons. I have updated the licenses covering this site, and I challenge you to update yours too, or to seriously consider applying a CC License to your work.