| 摘要 |
A system for preventing an unauthorized user in a networked computing environment includes a client computer provided with a visual test upon a request transmitted through a network by the client computer for a service, wherein the visual test is displayed on a video display, wherein the visual test requires the performance of a predetermined action on a group of images displayed on the video display in order to gain access to the service, wherein the group of images comprises at least two images that are associated with each other.
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