core + pending (Pending Extension): these terms are pending wider review. Feedback is welcomed!

sdPublisher

Defined in the pending.schema.org extension.
Canonical URL: http://schema.org/sdPublisher

Thing > Property > sdPublisher

Indicates the party responsible for generating and publishing the current structured data markup, typically in cases where the structured data is derived automatically from existing published content but published on a different site. For example, student projects and open data initiatives often re-publish existing content with more explicitly structured metadata. The sdPublisher property helps make such practices more explicit.
Values expected to be one of these types
Organization
Person
Used on these types
CreativeWork

Source

https://github.com/schemaorg/schemaorg/issues/1886

Schema Version 3.4