[Insight-users] VTK&&ITK

[Luis Ibanez]

Hi Wen,


The ITK Tutorials and Users Guide are can be downloaded
free of charge be because the US National Library of Medicine
paid us for creating this material and for making it available.


In other words, these material was paid by US Taxpayers,
and kindly shared with the rest of the world.


This is a typical way of funding Public Goods, which are the
ones that are non-Rivalous and non-Excludable.


If you are interested in the Economic aspects of Open Source,
we have a wealth of material that we could refer you to.     :-)



    Regards,


         Luis


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On Thu, Sep 10, 2009 at 5:14 PM, Wen Shi <wsa18 at sfu.ca> wrote:

> Hi Guys,
>
> Just curious.
> Why the tutorial and user guide of ITK are totally free, but in VTK the
> tutorial and user guide are commercial products?
> That's a little bit tricky, since both of them are open Sources. But if you
> want to learn VTK, then you need to buy the references.
> Did you guys all buy the books of VTK or just figure it out yourselves?
>
> Thanks
>
> Wen Shi
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