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I wonder how this works, since the 'Attribution' required was a clause added at some point AFTER the initial data dumps, does this mean all content before that date can be used w/o attribution?

(note: I am not using the data at all, just curiuos).

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Was it added afterwards? – Pëkka Aug 12 '10 at 15:53
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If I am not mistaken, that clause was always there. It just wasn't clarified until June of '09. – mmyers Aug 12 '10 at 15:53
    
i think it was added. – Blankman Aug 12 '10 at 15:55
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Attribution required was set before the site even started. Jeff had a blog post about it. – BinaryMisfit Aug 12 '10 at 16:07

The CC license pre-dates the data dump.

Now Licensed Under Creative Commons - Posted by Jeff Atwood on May 5th, 2008

Stack Overflow Creative Commons Data Dump - Posted by Jeff Atwood on June 4th, 2009

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