This document summarizes the open access requirements and support services for Horizon 2020 projects. It outlines that beneficiaries must provide open access to peer-reviewed publications by depositing them in a repository. It describes the two main routes of open access - green (self-archiving) and gold (open access publishing). It provides guidance on where and when to deposit publications and data, and the required metadata. It notes support services available through OpenAIRE, such as depositing, reporting, and linking publications to projects. Non-compliance with open access requirements could lead to reduced grants or other measures.