[moey]

I think you ARE missing the point. Watching the bytes come over the wire isn't something that they are trying to protect. Just easy cheating in the classroom. They probably received some complains from teachers.

They wanted to keep it working offline, and hints should still be available for students in areas with spotty internet.

It's not Khan Academy responsibility to ensure students don't cheat after all. I mean for all they know the students could have other browsers/computers open.

[arcatek]

The post title is a bit misleading, then. The way I see it, it's more like a bug they fixed (since people could legitimately lose their connection and have their hint count wrong) rather than a real no-cheat policy.