Method and system for preventing the downloading and execution of executable objects

A method for selectively preventing the downloading and execution of undesired Executable Objects in a computer. The method comprises when an Executable Object is detected at a gateway, analyzing the header of the Executable Object, determining the resources of the computer that the Executable Object needs to utilize, comparing the resources of the computer that the Executable Object needs to utilize with a Security Policy and if the resources of the computer that the Executable Object needs to utilize are included in the list of the resources prohibited for use by the Security Policy, preventing the Executable Object from passing through the gateway, thereby preventing it from reaching the computer which has initiated its downloading.