A release version is a particular grouping of one or many recordings. It's the introduction of a particular group of recordings of work(s) to a market. Different versions of the same album for different territories may be identified as different releases by their identifiers, such as GRid, UPC or EAN. A GRid is the Global Release Identifier. GRid provides a system for the unique identification of ""Releases"" of music over electronic networks, so that they can be managed efficiently. An UPC or EAN is a Universal Product Code or International Article Number (was European originally, hence the “E”). This identifies a product for retail sale, and is often the number encoded in a barcode font. Traditionally, barcodes were different in different regions, and whilst this has been standardized, it is still at the discretion of the releasing company. For example, exactly the same release in the US and Australia may or may not have a different UPC, depending on the processes in place by the releasing entity. David Bowie’s Blackstar album has 6 different UPC’s for exactly the same release. This is based on the different barcodes for different formats (Vinyl, CD, Digital, etc.)