This specification defines a container-independent initialization data format for specifying a list of key IDs to the createSession() method defined by the Encrypted Media Extensions. This type can be used by applications to directly provide information necessary to generate a license request without using media data or constructing container-specific formats.

Unlike other similar specifications, this one does not document a stream format or behavior related to processing media data. This type and format are not used in the Initialization Data Encountered algorithm.

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Table of Contents

1. Initialization Data Format

The format is a JSON object containing the following member:

An array of key IDs. Each element of the array is the base64url encoding of the octet sequence containing the key ID value.

See Using base64url.

When passed to the update() method as the Uint8Array response parameter, the JSON string must be encoded in UTF-8 as specified in the Encoding specification [encoding]. Applications may encode the JSON string using the TextEncoder interface [encoding].

1.1 Example

This section is non-normative.

The following example will generate a license request for two key IDs. (Line breaks are for readability only.)

Example 1
See a problem? Select text and .

A. References

A.1 Normative references

Anne van Kesteren; Joshua Bell; Addison Phillips. Encoding. 28 January 2014. W3C Working Draft. URL: http://www.w3.org/TR/encoding/