There are several licenses which attempt to imitate or facilitate public domain status already, most notably Creative Common's CC0 (http://creativecommons.org/a

There are several licenses which attempt to imitate or facilitate public domain status already, most notably Creative Common's CC0 (http://creativecommons.org/about/cc0 http://creativecommons.org/about/cc0) and the WTFPL (http://sam.zoy.org/wtfpl/ http://sam.zoy.org/wtfpl/).