To create dynamic copyright messaging that will update as time passes and stay accurate when the author's death year (ADY) is known. Direction for including ADY is in each template document.

Published prior to 1923, ADY 100+ years ago {{PD-old}}
Published prior to 1923, ADY anything less then 100 years ago {{Pd/1923}}
Published after 1922 and before 1964, Non-renewal confirmed {{PD-US-no-renewal}}
Published between 1923 and 1996 {{Pd/1996}}