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Программистам Microsoft запрещают читать open source код?

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Во время поиска решения проблемы, в списках рассылки разработчиков Apple наткнулся на интересное письмо:

On 12/29/07 12:42 PM, «Steve Peters» <email@hidden> wrote:

<snip />

> For the answer to this (and many other curiosities) consult the kernel
> source at
> <www.opensource.apple.com/darwinsource/10.5/xnu-1228>

Alas, this resource is not available to us Microsoft employees. Our
corporate policy prohibits the reading of open source code (that isn't
ours), because that avoids the possibility of introducing IP taint into our
commercial products**. We're limited to reading plain old documentation, so
if you have pointers to that, we'd appreciate it.


* Strictly speaking, we could theoretically infringe by implementing
something exactly in the way of a pre-existing patent, but this way, our
exposure is significantly limited.

— Nathan Herring
CoreCLR SDE/Development

В принципе, все логично: программистам из Microsoft не разрешают читать чужой open-source код, чтобы те случайно не включили его в свои программы, ведь в случае GPL кода, придется открывать весь исходный код программы.
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