9. A system having at least one processor for updating a document, comprising: a document content updater, implemented a on the at least one processor and configured to determine a web-based source from which a section of content in an electronic document was copied based, at least in part, on attribution information provided in the electronic document for the section of content, determine one or more updates relative to the section of content based, at least in part, on a copy of the web-based source downloaded by a web crawler configured to methodically browse a World Wide Web for documents to copy and download web content, and provide the determined one or more updates relative to the section of the content to be indicated in the electronic document, wherein one or more updates relative to the section of the content occur after the section of content being copied from the web-based source to the electronic document.
9. A system having at least one processor for updating a document, comprising: a document content updater, implemented a on the at least one processor and configured to determine a web-based source from which a section of content in an electronic document was copied based, at least in part, on attribution information provided in the electronic document for the section of content, determine one or more updates relative to the section of content based, at least in part, on a copy of the web-based source downloaded by a web crawler configured to methodically browse a World Wide Web for documents to copy and download web content, and provide the determined one or more updates relative to the section of the content to be indicated in the electronic document, wherein one or more updates relative to the section of the content occur after the section of content being copied from the web-based source to the electronic document. 10. The system of claim 9 , wherein prior to determining the update, the document content updater is configured to determine a time at which the copy of the web-based source contained in the web content was downloaded by the web crawler, and determine that the copy of the web-based source is more up-to-date relative to the section of content in the electronic document if the determined time is more recent than a time that the electronic document was last edited.