DRM(数字权限管理技术)防截屏录屏----解密org.w3.clearkey视频并播放

提示：解密org.w3.clearkey视频并播放
帮助：未实现clearkey加密，如有大神，请指导一下

文章目录

@[TOC](文章目录)

前言
一、教程
二、org.w3.clearkey视频播放
三、效果
四、问题
总结

前言

‌‌ClearKey‌是一种基于JSON Web Key (JWK)格式的内容加密方案，主要用于在Web环境中保护媒体内容的安全传输和播放。ClearKey通过使用JSON Web Tokens (JWT)来传输密钥信息，确保只有持有正确密钥的用户才能解密和播放受保护的媒体内容。

ClearKey的工作原理
‌1、密钥管理‌：ClearKey使用JWT来传输密钥信息，JWT包含三个部分：头部、有效载荷和签名。头部描述了令牌的类型和加密方法，有效载荷包含密钥信息，签名用于验证令牌的真实性。
2‌、密钥获取‌：在播放受保护的媒体内容时，浏览器会向服务器请求JWT，服务器验证请求者的身份后，返回包含密钥信息的JWT。
3‌、解密播放‌：浏览器使用JWT中的密钥信息对媒体内容进行解密，然后通过MediaSource Extensions (MSE)进行播放。

一、教程

mse-eme教程

二、org.w3.clearkey视频播放

test.html

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title>
</head><body><video preload="auto" id="video" controls></video><script>const KEYSYSTEM_TYPE = "org.w3.clearkey";var videoFragments = [// demo 视频"video/init.mp4","video/seg-1.mp4","video/seg-2.mp4","video/seg-3.mp4","video/seg-4.mp4","video/seg-5.mp4","video/seg-6.mp4","video/seg-7.mp4"];var name = 'video';// 音频类型const audioContentType = 'audio/mp4; codecs="mp4a.40.2"'; // AAC-LC// 视频类型const videoContentType = 'video/mp4; codecs="avc1.42E01E"'// 创建mediaSourceconst videoSource = new MediaSource();var keys = {"2fef8ad812df429783e9bf6e5e493e53": "7f412f0575f44f718259beef56ec7771","7eaa636ee7d142fd945d1f764877d8db": "624db3d757bb496fb93e51f341d11716"};async function load() {const videoEl = document.getElementById('video');videoEl.src = URL.createObjectURL(videoSource);videoEl.sessions = [];// 解码videoEl.addEventListener("encrypted", async(ev) => {let options = [{initDataTypes: ["cenc"],videoCapabilities: [{contentType: videoContentType}],audioCapabilities: [{contentType: audioContentType}]}];if (typeof(MediaKeySystemAccess.prototype.getConfiguration) == "undefined") options = [{initDataType: "cenc",videoType: videoContentType,audioType: audioContentType}];// 获取系统允许let systemAccess = await navigator.requestMediaKeySystemAccess(KEYSYSTEM_TYPE, options);// 获取mediaKeysvar mediaKeys = await systemAccess.createMediaKeys();// 设置播放器mediaKeysawait videoEl.setMediaKeys(mediaKeys);// 生成sessionlet session = await videoEl.mediaKeys.createSession();videoEl.sessions.push(session);// 获取请求let request = await session.generateRequest(ev.initDataType, ev.initData)session.addEventListener("message", async(e) => {let message = ArrayBufferToString(e.message);let msg = JSON.parse(message);let outKeys = [];for (let i = 0; i < msg.kids.length; i++) {// 获取单个message的idlet id = msg.kids[i];// 获取全小写的hex格式的idlet hexId = Base64ToHex(id).toLowerCase();// 获取keys中键为hexId的值 let key = keys[hexId];if (key) outKeys.push({"kty": "oct","alg": "A128KW","kid": id,"k": HexToBase64(key)});}if (outKeys.length < 1) return console.log('解码失败!!!')let update = JSON.stringify({"keys": outKeys,"type": msg.type});await e.target.update(StringToArrayBuffer(update));});session.addEventListener("keystatuseschange", (e) => {});})videoSource.addEventListener('sourceopen', openSourceFile)}// Hex转base64function HexToBase64(hex) {var bin = "";for (var i = 0; i < hex.length; i += 2) {bin += String.fromCharCode(parseInt(hex.substr(i, 2), 16));}return window.btoa(bin).replace(/=/g, "").replace(/\+/g, "-").replace(/\//g, "_");}// base64转Hexfunction Base64ToHex(str) {var bin = window.atob(str.replace(/-/g, "+").replace(/_/g, "/"));var res = "";for (var i = 0; i < bin.length; i++) {res += ("0" + bin.charCodeAt(i).toString(16)).substr(-2);}return res;}// buffer转字符串function ArrayBufferToString(arr) {var str = '';var view = new Uint8Array(arr);for (var i = 0; i < view.length; i++) {str += String.fromCharCode(view[i]);}return str;}// 字符串转bufferfunction StringToArrayBuffer(str) {var arr = new ArrayBuffer(str.length);var view = new Uint8Array(arr);for (var i = 0; i < str.length; i++) {view[i] = str.charCodeAt(i);}return arr;}// 打开文件async function openSourceFile() {videoSource.removeEventListener('sourceopen', openSourceFile);let sourceBuffer = videoSource.addSourceBuffer(videoContentType);let bufferList = [];let count = 0;if (videoSource.readyState == 'closed') return console.log('视频readyState为关闭');// for循环里直接appendBuffer会报错for (let i = 0; i < videoFragments.length; i++) {const buffer = await loadFile(videoFragments[i]);if (buffer) bufferList.push(buffer);}// 首次appendBufferawait sourceBuffer.appendBuffer(bufferList[count]);sourceBuffer.addEventListener("updateend", async() => {count++;if (count < bufferList.length) await sourceBuffer.appendBuffer(bufferList[count]);});}// 加载文件function loadFile(src) {return new Promise((resolve, reject) => {let xhr = new XMLHttpRequest();xhr.open('GET', src);xhr.responseType = 'arraybuffer';xhr.addEventListener("load", (buffer) => {resolve((buffer.target || buffer.target).response)});xhr.addEventListener("error", () => {console.log("error：" + src);reject();});xhr.addEventListener("abort", () => {console.log("aborted：" + src);reject();});xhr.send()});}load();</script>
</body></html>

三、效果

demo仅加载视频示例，未加载音频
在这里插入图片描述

视频仅做测试使用，未进行任何商业用途，遮挡一下看到播放效果即可，如有侵权，联系作者删除。

四、问题

加密插件：
shaka package：3.4.0、3.3.0、3.2.1执行无反应，使用3.2.0可执行加密，但不支持clearkey

packager input=libx264.mp4,stream=video,output=encrypted_video.mp4 --keys key_id=00112233445566778899aabbccddeeff:key=ffeeddccbbaa99887766554433221100 --enable_raw_key_encryption --protection_systems "Widevine"

ffmpeg：不支持DRM的ckearkey加密

// ffmpeg -i test2.mp4 -vcodec copy -acodec copy -encryption_scheme cenc-aes-ctr -encryption_key 76a6c65c5ea762046bd749a2e632ccbb -encryption_kid a7e61c373e219033c21091fa607bf3b8 output.mp4
// ffmpeg -i test2.mp4 -c:v libx264 -c:a aac -f mp4 -encryption_scheme cenc-aes-ctr -key 76a6c65c5ea762046bd749a2e632ccbb -encryption_kid a7e61c373e219033c21091fa607bf3b8 encrypted_video.mp4

mp4Box：未实现

// MP4Box.exe -crypt drm.xml test2.mp4 -out tempv.mp4
// MP4Box.exe -crypt drm.xml test2.mp4 -out tempa.mp4
// MP4Box.exe -dash 6000 -frag 6000 -mem-frags -rap -profile dashavc264:live -profile-ext urn:hbbtv:dash:profile:isoff-live:2012 -min-buffer 3000  -bs-switching no -sample-groups-traf -single-traf -subsegs-per-sidx 1 -segment-name $RepresentationID$_$Number$$Init=i -segment-timeline -out manifest.mpd tempv.mp4#trackID=1:id=v1:period=p0 tempa.mp4#trackID=1:id=a1:period=p0