copyright block: Meaning and Definition of

cop'yright block"

Pronunciation: [key]
— Philately. Philately.
  1. a block of four or more U.S. stamps that includes, in the selvage of the sheet, the copyright mark of the U.S. Postal Service.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.