According to Stefano Casillo, netKar Pro will become freeware as Kunos will be ending official support for the title later this year.
What this means in terms of whether people will be able to look into the source code; the potential for third party mods and user supported multiplayer is yet to be seen. However, if you’re interested in trying out a decent sim that has above average physics and a tire model that is a close match to Assetto Corsa, now is your chance. 
Freeware is not the same as Open-Source.
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Very astute observation. However if you read you would have seen that I said it is “yet to be seen”
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“What this means is people will be able to look into the source code;”
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