core + attic (Attic Area): these terms have been either deprecated from the core or extentions, or removed from pending as not accepted into the full vocabulary.

copyrightYear

Canonical URL: http://schema.org/copyrightYear

Thing > Property > copyrightYear

The year during which the claimed copyright for the CreativeWork was first asserted.

Usage: Between 10,000 and 50,000 domains
Values expected to be one of these types
Number
Used on these types
CreativeWork

Schema Version 3.4