15. A computer-usable storage medium having instruction embodied therein that when executed cause a computer system to perform a method for determining a subset of documents from which a particular document was derived, the method comprising receiving similarity measurements indicating similarities between contents of documents, wherein the documents are unstructured documents that do have document tracking information; and using the similarity measurements to determine a subset of the documents that a particular document was derived from whereby analyzing the unstructured documents is enabled.
15. A computer-usable storage medium having instruction embodied therein that when executed cause a computer system to perform a method for determining a subset of documents from which a particular document was derived, the method comprising receiving similarity measurements indicating similarities between contents of documents, wherein the documents are unstructured documents that do have document tracking information; and using the similarity measurements to determine a subset of the documents that a particular document was derived from whereby analyzing the unstructured documents is enabled. 20. The computer-usable storage medium of claim 15 , wherein the computer-readable program code embodied therein causes a computer system to perform the method, and wherein the method further comprises: determining an order that documents associated with the subset were used to derive the particular document based on how similar each document in the subset is to the particular document.