[Vaskivo]

I thought the *chan code was open.

Or is this some critical bit? (I noticed it handles cookies, but I'm too unexperienced with web, php or web-security to explore this wall of code)

[rossy]

4chan's code (Yotsuba) has always been a closed source fork of Futaba, though there are several open source Futaba clones, like Kusaba X.