Abstract: A method, and a computer with instructions for performance of the method. An applet runs on a user device of the internet. Using a reliable interface on the user device, the applet has captured validation data describing the user device and software execution on the user device. The captured validation data are stored. The validation data includes at least a unique device ID for the user device, and a session ID for a program running on the user device. When a service provider server receives a service request from the user device, data for the request are received at the validation server. Data from the request are compared against the stored validation data. The compared data include at least a device ID and session identifier. The validation server reports validation or refusal of validation depending on whether the comparing determines a match or mismatch between the request data and the stored validation data.