Restrict how kids learn
All of these technologies for restricting what kids can do have flaws, and kids should be naturally curious anyway...
If something is forbidden, they will seek out ways to get it anyway.. If you're relying on technology to prevent kids from seeing porn then sooner or later they will see porn anyway. But because you've forbidden it, they will be more likely to seek it out and less aware of what it is.
Instead you should educate kids, explain to them what is out there, teach them to behave safely online (ie not giving away personal information or executing random binaries etc). Young kids won't even be interested in porn once they know what it is, but they will be interested in something unknown just because they aren't allowed to have it.
Another good example is alcohol.. Most alcoholic drinks taste quite disgusting to a child, but alcohol being forbidden makes it desirable. When i was a kid and saw my parents drinking alcohol, they let me try some... I invariably disliked the taste and subsequently had no interest in acquiring more alcohol.
Other people i went to school with were always forbidden from drinking alcohol, so they would actively seek to obtain alcohol illicitly (through theft, finding someone willing to sell it to them or buy it on their behalf etc) and consume it. I had no interest in doing this because i knew i could easily obtain alcohol from my parents simply by asking for it, and didn't like the taste of it anyway.
Biting the hand that feeds IT
