"So, you've set up parental filtering, only to discover that an overachieving teenager has Googled a way around it. You've just been the victim of a local intrusion. Preventing such an occurrence on GNU/Linux requires a little knowledge and even less work. Here's how.
"A local intrusion occurs when a computer is 'cracked' by someone with physical access to a computer. This can be done with actual hacking techniques, or by exploiting built-in boot (failsafe) modes that your computer's operating system, bootloaders, and BIOS contain..."
