Just how does such a piece of software prevent accessing porn, when it is trivial to bypass it?
Think booting from a USB or other drive, so this kind of software never gets a chance to even startup.
And what is to prevent a kid from spending $79 on a netbook that you don't even know about?
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Warning - I am not an expert on anything having to do with this forum, but that won't stop me from saying what I think.

Bob