77a8603f_ervation__Library_of_Congress___Definition
[Term] Derivative [Definition] 
A transformed version of an original source file, often called a "service," "access," "delivery," "viewing" or "output" file, used to facilitate access to or additional use of the content.
NDSA Levels of Preservation Glossary - National Digital Stewardship Alliance - Digital Preservation (Library of Congress)
Definition