License for the tzdata information

[Dave Rolsky]

On Tue, 28 Apr 2009, Olson, Arthur David (NIH/NCI) [E] wrote:

> There's no license.

Everything has a license. No license (in the US) means that someone (you?) 
retains all rights.

Obviously, I know you don't _mean_ that, so it'd be good to include an 
explicit license. It seems like a BSD license would work well.


-dave

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