Abstract: System and methodology protecting against key logger software (spyware) is described. In one embodiment, for example, a method is described for protecting a computer system from security breaches that include unauthorized logging of user input, the method comprises steps of: specifying a particular application to be protected from unauthorized logging of user input; identifying additional system processes that may serve as a source of unauthorized logging of user input; injecting into the particular application and each identified system process an engine capable of detecting and blocking attempts at unauthorized logging of user input; and upon detection of an attempt at unauthorized logging of user input, blocking the attempt so that user input for the particular application remains protected from unauthorized logging.