B2C marketers know how difficult it is to build and maintain a trusted relationship with consumers. The introduction of regulations like the European Union's General Data Protection Regulation (GDPR) and Vermont's data broker registration law make the use of third-party data — a crucial marketing tool — even more difficult for marketers. There's another option, though: zero-party data. This report dives into zero-party data, how it differs from first-party data, and how B2C marketers should treat this sensitive information.