Provided is a system and method for the de-duplication and modification detection of documents collected during document production. The disclosed technology provides a simple, legally defensible, rapid and cost-efficient system for collecting responsive electronic document sets, identifying and eliminating unnecessary documents by comparing a collected document to previously collected documents and copying only information that has not been duplicated. The disclosed technology provides a method for copying the unduplicated information without transmitting or storing the duplicated portions. In addition, the claimed subject matter provides a system for detecting whether or not a document being submitted to a project archive is a modification of a previously submitted document. A document being submitted that represents a modification of a previously submitted document is prevented from being added to the project document archive.