Possible Clues:

• Personal check?
• Web test that might have accessibility issues
• Challenge for a web user
• Test to keep out bots
• Computer test used in diagnostic: apt challenge
• Top, non-European technology linked to advanced verification program
• Page in contract on a security system
• A test of one's humanity?
• In computing, a question to prove you're not a robot
• Test to prove you’re not a bot