==copyrights from .gov == 
 Hi Mark.  To answer this question, no, not all content on .gov web pages is in the public domain. Works created by employees of the U.S. federal government as a part of their duties are PD, but publications by state and local governments (which often use .gov too) are generally not.  To make things even more complicated, we even need to be careful with publications of the federal gov, as they may contain content copyrighted to contractors or included under fair use. Take a look at WP:PD#U.S. government works for more info. All the best. ×