When a publisher acquires rights for resources that are part of the publication, these should also include rights pertaining to the preservation of those resources. Express these rights in the metadata in a way that allows a preservation institution to determine what they have permission to preserve and relate them to the relevant material.
These guidelines may also support the creation of license metadata:
8. Clarify the license related to preserving third party web resources
24. Create descriptive metadata for each publication resource
40. Embed license information in the HTML