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I went to the ISO site to purchase the specification. What are the CORs and AMDs?

April 26, 2017cors ISO purchase site specification

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I went to the ISO site to purchase the specification. What are the CORs and AMDs?

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COR stands for Corrigenda. A Corrigenda is issued whenever corrections are needed to fix the specification due to (usually small) editing errors. AMD stands for Amendment, and is issued whenever new functionality is added to the standard, such as the streaming video profiles. Amendments in MPEG-4 do not invalidate earlier, already deployed products. They enhance the standard.