Show navigationGuidance on Identifiers and ISO Codes ListsAvoiding the use of proprietary Identifiers Bar codes of various lengths Can a release be identified by an ISRC? Communication of identifiers in DDEX messages Do DPIDs have hyphens? How many DPIDs Do I need? Identifiers for resources, releases and parties Identifying Chapters Identifying sound recordings and videos containing the same audio Limitations of proprietary identifiers Malformed identifiers Multiple proprietary identification systems Opus and composer catalogue numbers Proprietary identifiers Should I use an ISRC as the primary key for my database? Territory codes (ISO 3166-1, ISO 3166-3, TIS) Worldwide