Updated Copyright Term Chart available

A new version of the copyright duration chart, "Copyright Term and the Public Domain in the United States," is now available at a new URL: http://www.copyright.cornell.edu/public_domain/.

The biggest change is that, at the request of a user, two new sections have been added.  The first is on published and unpublished sound recordings, and the second is on architectural works.  Other small changes have been made to clarify some of the problems other readers have identified.  In order to facilitate printing, a PDF version of the file is available as well.

As you can tell, the chart is a constant work in progress, and I welcome corrections or suggestions for improvements.