Patent ID: 8209741

Claim:
A computer-implemented system for determining whether input is from a machine or from a human user, the computer-implemented system comprising memory and a processor, and further comprising: a human interactive proof (HIP) challenge component that presents a HIP challenge, where the challenge is stored in the memory; and a HIP determination component executed by the processor that employs a partial credit algorithm to determine that a responder to whom the HIP challenge is conveyed is a human or non-human based, at least, on a response to the challenge provided as input by the responder, where the response is stored in the memory, the partial credit algorithm including a determination that a plurality of songs are categorized in a correct genre of a plurality of genres based on one or more of the plurality of songs being previously determined to have a likelihood of correct categorization being less than a predetermined value, and is configured to assign the responder partial credit for correct categorization of one or more of the plurality of songs, and a value of the partial credit in the memory is indicative of whether the responder is a human or a non-human.