Content reference identifier: Difference between revisions

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{{hatnote|1=CRID redirects here. CRID may also refer to a current rail indicator device, a safety device indicating the presence of [[third rail]] power, or to a [[Ring-imaging Cherenkov detector|Cherenkov Ring-Imaging Detector]]}}

== Overview ==

A '''content reference identifier''' or '''CRID''' is a concept from the standardization work done by the [[TV-Anytime]] forum. It is or closely matches the concept of the [[Uniform Resource Locator]], or URL, as used on the [[World-Wide Web]]:

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The concept of CRID permits referencing contents unambiguously, regardless of their ___location, i.e., without knowing specific broadcast information (time, date and channel) or how to obtain them through a network, for instance, by means of a streaming service or by downloading a file from an Internet server.

The receiver must be capable of resolving these unambiguous references, i.e., of translating them into specific data that will allow it to obtain the ___location of that content in order to acquire it. This makes it possible for recording processes to take place without knowing that information, and even without knowing beforehand the duration of the content to be recorded: a complete series by a simple click, a program that has not been scheduled yet, a set of programs grouped by a specific criterion…

This framework allows for the separation between the reference to a given content (the CRID) and the necessary information to acquire it, which is called a “locator”. Each CRID may lead to one or more locators which will represent different copies of the same content. They may be identical copies broadcast in different channels or dates, or cost different prices. They may also be distinct copies with different technical parameters such as format or quality.

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In May 2005, an Informational RFC, [http://tools.ietf.org/html/rfc4078 No 4078], was published as the start of this work.

The long-term goal is that CRIDs should be available for use by [[cell phones]], [[Personal digital assistant|PDA]]s, [[Digital television|digital TV]] [[Set-top box|receivers]] and other [[Consumer electronics|consumer devices]] for fetching content, either from a broadcast stream or over [[internet protocol|IP]]-based [[computer network|networks]]s.

== See also ==