A system is provided to monitor a user's interaction with a computer. The system may comprise a reference string generator to generate a random reference string, an image generator to generate an image including the random reference string, a communications module to communicate the image to a client...http://www.google.fr/patents/US7770209?utm_source=gb-gplus-shareBrevet US7770209 - Method and system to detect human interaction with a computer
Method and system to detect human interaction with a computer
