Abstract: Restricting a web page's access to web services that do not display advertisements endorsed by the web service or its owner is described herein. A web page includes an IFrame where an advertisement is presented. The web page provides the functionality of a web service by communicating requests to a server hosting the web service. On a client computing device, a user may initiate a request to access the web service. The request may be sent to a broker configured to submit the request to the hosting server. The web service is exposed in such a way that it can only be called by an endorsed IFrame, also responsible for displaying advertisement on the web page.

Abstract: Methods and system of preventing unauthorized scripting. The invention includes providing one or more tests to a user for distinguishing the user from a machine when the user requests access to the server. By storing information on a correct solution to the test in a block of data and sending the block of data together with the test, the invention provides stateless operation. Moreover, maintaining a database of previously used correct responses prevents replay attacks. The invention also includes providing combinations of alternative tests, such as visually altered textual character strings, audible character strings, and computational puzzles. Other aspects of the invention are directed to computer-readable media for use with the methods and system.

Abstract: Restricting a web page's access to web services that do not display advertisements endorsed by the web service or its owner is described herein. A web page includes an IFrame where an advertisement is presented. The web page provides the functionality of a web service by communicating requests to a server hosting the web service. On a client computing device, a user may initiate a request to access the web service. The request may be sent to a broker configured to submit the request to the hosting server. The web service is exposed in such a way that it can only be called by an endorsed IFrame, also responsible for displaying advertisement on the web page.

Abstract: A human interactive proof (HIP) service is described. In response to a request from a web server, the HIP service generates a HIP challenge and an associated attestation. The web server can then embed the generated HIP challenge in a requested web page. The attestation is used to determine whether or not a user response to the HIP challenge is correct.