It's possible that putting things in the public domain is no longer allowed even in the US. Peter Saint-Andre puts all of his work in the public domain, but he

It's possible that putting things in the public domain is no longer allowed even in the US. Peter Saint-Andre puts all of his work in the public domain, but he wrote an essay with links almost three years ago discussing among other things that it may not be legal https://stpeter.im/index.php/2006/12/30/pd-howto/ https://stpeter.im/index.php/2006/12/30/pd-howto/ . He has a lot of other writings about PD and copyright issues here : https://stpeter.im/index.php/category/publicdomain/ https://stpeter.im/index.php/category/publicdomain/ . Note for those using IE; IE does not recognize his CA, you need to either click through or change the https to http.