text: /**
   * The copyright in this software is being made available under the BSD License,
   * included below. This software may be subject to other third party and contributor
   * rights, including patent rights, and no such rights are granted under this license.
   *
   * Copyright (c) 2013, Dash Industry Forum.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   *  * Redistributions of source code must retain the above copyright notice, this
   *  list of conditions and the following disclaimer.
   *  * Redistributions in binary form must reproduce the above copyright notice,
   *  this list of conditions and the following disclaimer in the documentation and/or
   *  other materials provided with the distribution.
   *  * Neither the name of Dash Industry Forum nor the names of its
   *  contributors may be used to endorse or promote products derived from this software
   *  without specific prior written permission.
   *
   *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
   *  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   *  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   *  IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   *  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   *  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   *  POSSIBILITY OF SUCH DAMAGE.
   *//**
   * Defines the public interface for all Key Systems (DRMs) supported
   * by the player.
   *
   * @interface KeySystem
   *//**
   * Key system name string (e.g. 'org.w3.clearkey')
   *
   * @instance
   * @name systemString
   * @memberof KeySystem
   * @readonly
   * @type String
   *//**
   * Key system UUID in the form '01234567-89ab-cdef-0123-456789abcdef'
   *
   * @instance
   * @name uuid
   * @memberof KeySystem
   * @readonly
   * @type String
   *//**
   * The scheme ID URI for this key system in the form
   * 'urn:uuid:01234567-89ab-cdef-0123-456789abcdef' as used
   * in DASH ContentProtection elements
   *
   * @instance
   * @name schemeIdURI
   * @memberof KeySystem
   * @readonly
   * @type String
   *//**
   * Parse DRM-specific init data from the ContentProtection
   * element.
   *
   * @function
   * @name KeySystem#getInitData
   * @param {Object} contentProtection the json-style contentProtection
   * object representing the ContentProtection element parsed from the
   * MPD XML document.
   * @returns {ArrayBuffer} EME initialization data
   *//**
   * For some key systems, the CDM message contains HTTP headers that
   * can be parsed by the application and attached to the license request.
   * Returns a header object with key/value pairs as object properties/values
   *
   * @function
   * @name KeySystem#getRequestHeadersFromMessage
   * @param {ArrayBuffer} message the CDM message
   * @returns {?Object} headers object with header names as the object property
   * names and header values as the corresponding object property values.  Return
   * null if no such headers were found or if the mechanism is not supported by
   * this key system
   *//**
   * For some key systems, the CDM message contains more than just the
   * license request data.  This method will pull the license request from
   * the CDM message, if necessary.
   *
   * @function
   * @name KeySystem#getLicenseRequestFromMessage
   * @param message {ArrayBuffer} the CDM message
   * @returns {Uint8Array} the license request message as will be passed to
   * XMLHttpRequest.send()
   *//**
   * Returns a license server URL as parsed from key system initialization data (PSSH).
   *
   * @function
   * @name KeySystem#getLicenseServerURLFromInitData
   * @param initData {ArrayBuffer} the initialization data.  This is just the "Data" field
   * from the PSSH box definition
   * @returns {?string} The license server URL or null if URL is not available in initData
   *//**
   * Returns specific CDM (custom) data.
   *
   * @function
   * @name MediaPlayer.dependencies.protection.KeySystem#getCDMData
   * @returns {ArrayBuffer} the CDM (custom) data
   *//**
   * Returns MediaKeySession session ID.
   *
   * @function
   * @name MediaPlayer.dependencies.protection.KeySystem#getSessionId
   * @returns {String} the MediaKeySession session ID
   */
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