Do all robots follow the rules for robots.txt?

The robots.txt file is only a guide and some bad robots ignore it.  Fortunately, there are tools for enforcing compliance with the robots exclusion protocol used in robots.txt, including:

• Robotcop
• The Robot Trap
• Bad Behavior / Bad Behaviour
• How to Defeat Bad Web Robots With Apache
• NukeSentinel (can be used to block bad robots)
• How to block spambots, ban spybots, and tell unwanted robots to go to hell
• A Spambot Trap

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