Data may be released under arrangements described in a formal Data Access Arrangement (or occasionally via a Service Level Agreement, a Concordat, or a contract).
Gellir rhyddhau data yn unol â'r trefniadau a ddisgrifir mewn Trefniant Mynediad i Ddata ffurfiol (neu weithiau drwy Gytundeb Lefel Gwasanaeth, Concordat, neu gontract).