Unique identifiers for objects, titles or other asset or metadata entities are critical for search and discovery and for system interoperability. The following are registered unique numbers. Most entertainment companies maintain unique numbering systems for their intellectual properties which usually uniquely identify title and version for feature films. Unique IDs are important to preservation in terms of identification and disambiguation, in automation, and in metric collection to ensure all assets are preserved.
- The Handle System — Implemented as Digital Object Identifier (DOI, ISO 26324), which provides an infrastructure for persistent unique identification of objects of any type. See doi.org.
- Entertainment Identifier Registry (EIDR) — A unique identifier system for movie and television assets.
- International Standard Audiovisual Number (ISAN) — A numbering system