A system and method are presented for assuring electronic documents containing active content. Aspects of the system and method are directed to storing a copy of input data called by the active content in a first invocation of the electronic document, then, on subsequent invocations of the electronic document, using the stored copy of the input data instead of calling for input data from the computing environment. In this way, the output from the subsequent invocations of the electronic document are the same as the output from the first invocation of the electronic document.