On Hive Marketing Cloud's Privacy Page you can request and collect all the privacy and GDPR related information that Hive Marketing Cloud is providing.
The privacy policy by is a legal document or statement that discloses how Hive Marketing Cloud gathers, uses, discloses, and manges their customers' data.
The basis for Hive Intelligence sharing, adding, uploading, hosting, accessing or sending personal data out of Europe. Vendors can also add a description of their own impact assessment for data transfers.
Subprocessors are companies that provide a service for Hive Intelligence and who has or potentially will get access to personal data of their customers.