TVI Electronics Security Measure

 
Web sites that accept postings from the public are often abused by spammers who use automated tools to post their links to many sites. While these spam links can be removed, they are a significant nuisance.
Sometimes, especially when creating new accounts or submitting request forms, we may show you an image of colored or distorted characters and ask you to type the characters shown. Since this task is hard to automate, it will allow most real humans to make their submissions while stopping most spammers and other robotic attackers.

Here is an example of a correctly completed human validation test:
security check image