R. R. Bowker,
Copyright: Its History and Its Law
“ Infringement is a question of fact rather than of intent. It is not a valid defense that the infringer is ignorant; nor, on the other hand, can any one be held for intention to infringe, where the act of infringement [Pg 253] has not been accomplished. The new American code, nevertheless, recognizes knowledge and intent in certain cases of punishment or damages by the use of the words "willfully" and "knowingly." ”
