On Bullhorn for Salesforce's Privacy Page you can request and collect all the privacy and GDPR related information that Bullhorn for Salesforce is providing.
The privacy policy by is a legal document or statement that discloses how Bullhorn for Salesforce gathers, uses, discloses, and manges their customers' data.
The basis for Bullhorn 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.