Article 3 identifies the categories of data within scope of Chapter II: data held by public sector bodies that is protected on grounds of commercial confidentiality (incl. trade secrets), statistical confidentiality, IP rights of third parties or personal data, but is permitted to be re-used under conditions set in Chapter II. Article 4 prohibits exclusive re-use arrangements (no public sector body may grant a single re-user exclusive rights to such data) except in limited public-interest exceptions (max 12-month renewal limit; transparency).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.