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This specification defines the "webm"
initialization data format for use with the Encrypted Media Extensions [ENCRYPTED-MEDIA].
This format is commonly used with the WebM Stream Format [EME-STREAM-REGISTRY].
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The format is a single key ID of one or more bytes, as defined by the ContentEncKeyID [Matroska] element and [WebM-Encryption].
As well as sections marked as non-normative, all authoring guidelines, diagrams, examples, and notes in this specification are non-normative. Everything else in this specification is normative.