And from Bitlaw: A mark is infringed under U.S. trademark law when another person uses a device (a mark) so as to cause confusion as to the source or sponsorship of the goods or services involved. Multiple parties may use the same mark only where the goods of the parties are not so similar as to cause confusion among consumers. Where a mark is protected only under common law trademark rights, the same marks can be used where there is no geographic overlap in the use of the marks. Federally registered marks have a nation-wide geographic scope, and hence are protected throughout the United States.

Bill

People that know everything by definition can not learn anything