 itself, a
broken seal indicating that the document has been opened. [Computer and Information Sciences] 
n., Wax impressed with a design and attached to any document as a sign of its authenticity; alternatively, an adhesive wafer or anything else intended to serve the purpose of a seal may be used. [Government] 
v., a) To confirm or make secure by or as if by a seal. b) To solemnize for eternity. [General Dictionaries] 
v., a) To confirm or make secure by or as if by a seal. b) To solemnize for eternity. [