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Reminds me of the infamous Rapidshare Captcha with cats. [1] There were hard to solve. However, also for humans. [1]: http://www.labnol.org/internet/favorites/

• soult 15y ago
  > However, also for humans. Which is exactly why they added those. Premium accounts do not require the user to enter a captcha for every download. So every user who was annoyed by the "cats captcha" was a potential customer.