I just read on slickdeals, that DivX is giving away free serial numbers for DivX Pro:
Win: http://www.divx.com/dff/index.php?version=win (http://www.divx.com/dff/index.php?version=win)
Mac: http://www.divx.com/dff/index.php?version=mac (http://www.divx.com/dff/index.php?version=mac)