A Partner System refers to each system that is involved in the mutual sharing of law enforcement information, with each party retaining ownership and possession of its information, and therefore becoming partners in law enforcement information sharing.
Data Source refers to a system that is operated by an organization that publishes information to a data repository.
Data Consumer refers to the data repository that receives and ingests the published information.
When a data repository republishes information that it does not own, it is acting as a Data Submitter.
A Data Owner is the original owner of the information that is submitted to the repository.
All there terms describe roles that a system can have.