Protovis became d3, which is BSD licensed. D3’s examples contain the same code. 
The author (Mike Bostock) is the same in both cases. I have just send him an 
email, I hope he responds.

Cheers
Bolke


> On 6 Jul 2017, at 15:08, Justin Mclean <jus...@classsoftware.com> wrote:
> 
> HI,
> 
>> [20] “nv.d3.js” originates from http://nvd3.org <http://nvd3.org/> and its 
>> license states it is Apache License 2, 
>> https://github.com/novus/nvd3/blob/master/LICENSE.md 
>> <https://github.com/novus/nvd3/blob/master/LICENSE.md> . And as far as I 
>> understand it it should not need to be licensed to the ASF to be using the 
>> APL2? 
> 
> Which is fine but if you look a litter closer you see in the file this 
> comment:
> 
> // Chart design based on the recommendations of Stephen Few. Implementation
> // based on the work of Clint Ivy, Jamie Love, and Jason Davies.
> // http://projects.instantcognition.com/protovis/bulletchart/
> 
> Going to that URL it’s unclear how that code is licensed.
> 
> Doing a google search show similar code that is GPL licensed.
> 
> Thanks,
> Justin
> 
> 
> 
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