core + meta (Meta Extension): terms used within schema.org for schema definitions.

isAccessibleForFree

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

Thing > Property > isAccessibleForFree

A flag to signal that the publication is accessible for free.
Values expected to be one of these types
Boolean
Used on these types
CreativeWork
Event
PublicationEvent
Supersedes
free

Schema Version 3.2