This document provides an overview of open data policies in Horizon 2020 (H2020) research projects. It discusses how H2020 mandates open access to peer-reviewed publications and research data generated by projects. Projects participating in the H2020 Open Research Data Pilot are required to make their data publicly available by depositing it in an open research data repository. Exceptions can be made if openly sharing the data would jeopardize commercialization, privacy, or the project's main goals. The document also outlines licensing options, metadata standards, and resources like Zenodo that can help researchers comply with H2020 open data requirements.