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Property "Has-20project-20description" (as page type) with input value "reCAPTCHA-20is-20a-20user-2Ddialogue-20system-20originally-20developed-20by-20Luis-20von-20Ahn,-20Ben-20Maurer,-20Colin-20McMillen,-20David-20Abraham-20and-20Manuel-20Blum-20at-20Carnegie-20Mellon-20University's-20main-20Pittsburgh-20campus,-20and-20acquired-20by-20Google-20in-20September-202009.-20Like-20the-20CAPTCHA-20interface,-20reCAPTCHA-20asks-20users-20to-20enter-20words-20seen-20in-20distorted-20text-20images-20onscreen.-20By-20presenting-20two-20words-20it-20both-20protects-20websites-20from-20bots-20attempting-20to-20access-20restricted-20areas-20and-20helps-20digitize-20the-20text-20of-20books.-20The-20reCAPTCHA-20service-20supplies-20subscribing-20websites-20with-20images-20of-20words-20that-20optical-20character-20recognition-20(OCR)-20software-20has-20been-20unable-20to-20read.-20The-20subscribing-20websites-20(whose-20purposes-20are-20generally-20unrelated-20to-20the-20book-20digitization-20project)-20present-20these-20images-20for-20humans-20to-20decipher-20as-20CAPTCHA-20words,-20as-20part-20of-20their-20normal-20validation-20procedures.-20They-20then-20return-20the-20results-20to-20the-20reCAPTCHA-20service,-20which-20sends-20the-20results-20to-20the-20digitization-20projects." contains invalid characters or is incomplete and therefore can cause unexpected results during a query or annotation process.

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