Following the example of Yahoo!'s CC-search that was released in March 2004 and then incorporated into Yahoo!'s Advanced Search page, Google has incorporated a new element into its Advanced Search page that allows users to filter their search by Usage Rights. By choosing to search for content that "allows some form of reuse" or "can be freely modified, adapted or built upon", search results with be limited to content that is made available under a Creative Commons license.From the Creative Commons news release. Are we identifying CC licenses for Web sites we include in the catalog? How often is field 540 used? Is this something our users want? Google and Yahoo! seem to think so. I know, in my catalog, when I do include rights information it is not is a standard language, so it would make limiting by that field difficult.