scope:

Purpose and Scope

This recommended practice defines metadata indicators to be used to indicate free-to-read content and a link to license terms for the use/reuse of that content. Humans and machines will be able to assess the status of the content based on these indicators, and in many cases the combination of the free_to_read and license_reference metadata will indicate open access content. The indicators include a date component so that content with access and reuse rights that change over time can be adequately understood by both humans and machines using the metadata.

This recommended practice also defines metadata indicators that may be used to be used to specify a specific framework or context in which permissions are being conveyed.