GPL Licensed.
There are also demo and download links on my site for a two column version of Vibrant.
Info link: http://emptynestthemes.emptynestheritage.com/?p=2828
Demo link:
http://emptynestthemes.emptynestheritage.com/DemoBlog//?preview_theme=Vibrant
Download link:
http://emptynestthemes.emptynestheritage.com/wp-content/plugins/download-monitor/download.php?id=134