Offline License Release Request

[sojadhav]

Have you read the Tutorials?
Yes

Have you read the FAQ and checked for duplicate open issues?
Yes

If the question is related to FairPlay, have you read the tutorial?

NA

What version of Shaka Player are you using?
v4.15.7 (https://shaka-player-demo.appspot.com/)

What browser and OS are you using?
Chrome Browser, Windows 11

Please ask your question

I am working on widevine offline license, I was able to play downloaded content using offline license but when I try to delete content, I do NOT see license release request from client

Widevine documentation states following

`Once a license is persisted on the device and the client wants to remove the license, the application will initiate a license release. This will generate a license request with the request type (NEW, RENEWAL or RELEASE) set to RELEASE.

The Widevine client will not delete the license from the device until it receives a valid license response indicating the license release was handled by the license server. The proxy must return the license to the client.`

Que :

1. When you delete content from shaka player UI (your device is online at time of delete), why shaka player is not initiating license release

[joeyparrish]

It certainly should. await storage.remove(URI) should trigger a license release, but that Storage instance needs to have a DRM config at the time you call that method. If you create a new instance and call remove(URI) without DRM config, it won't have anywhere to route that message.

Any time an offline session cannot be released for any reason, the session ID is tracked in the database for later. If you have a properly-configured Storage instance, even after the content itself is gone, you can release any old offline licenses with await storage.removeEmeSessions().

Does this help?

[sojadhav]

Hi @joeyparrish

In which cases storage instance will not have DRM config, I am not changing anything in shaka code, I am using https://shaka-player-demo.appspot.com/, I made sure that offline license support is 'on' in shaka demo player UI

I see drmInfo in IndexedDB storage under manifest-v5 table, when I download content for offline playback

drmInfo:
audioRobustness: "SW_SECURE_CRYPTO"
distinctiveIdentifierRequired: false
encryptionScheme: "cbcs"
initData: []
keyIds: Set(0) {size: 0}
keySystem: "com.widevine.alpha"
licenseServerUri: "[https://afc91f03457c.ngrok-free.app/widevine/get_license"](https://afc91f03457c.ngrok-free.app/widevine/get_license%22)
persistentStateRequired: false
serverCertificate: undefined
serverCertificateUri: ""
sessionType: "persistent-license"
videoRobustness: "SW_SECURE_DECODE"

When I remove offline content, IndexedDB storage is no longer having entries in manifest-v5 & segments-v5 tables,
session-id table contains one entry related to removed offline content

{sessionId: '8AFE7BED34843F0F6D1C0039C00CBDEF', keySystem: 'com.widevine.alpha', licenseUri: '[https://afc91f03457c.ngrok-free.app/widevine/get_license'](https://afc91f03457c.ngrok-free.app/widevine/get_license%27), serverCertificate: undefined, audioCapabilities: Array(1), …}

Also, I see following error in consol log, when I remove offline content

{
    "severity": 2,
    "category": 6,
    "code": 6001,
    "data": [],
    "handled": false,
    "message": "Shaka Error DRM.REQUESTED_KEY_SYSTEM_CONFIG_UNAVAILABLE ()",
    "stack": "Error: Shaka Error DRM.REQUESTED_KEY_SYSTEM_CONFIG_UNAVAILABLE ()\n    at new shaka.util.Error (https://shaka-player-demo.appspot.com/dist/shaka-player.ui.debug.js:190:844)\n    at $jscomp.generator.Engine_.program_ (https://shaka-player-demo.appspot.com/dist/shaka-player.ui.debug.js:663:419)\n    at $jscomp.generator.Engine_.nextStep_ (https://shaka-player-demo.appspot.com/dist/shaka-player.ui.debug.js:37:105)\n    at $jscomp.generator.Engine_.next_ (https://shaka-player-demo.appspot.com/dist/shaka-player.ui.debug.js:33:234)\n    at $jscomp.generator.Generator_.next (https://shaka-player-demo.appspot.com/dist/shaka-player.ui.debug.js:38:73)\n    at https://shaka-player-demo.appspot.com/dist/shaka-player.ui.debug.js:39:227\n    at new Promise (<anonymous>)\n    at $jscomp.asyncExecutePromiseGenerator (https://shaka-player-demo.appspot.com/dist/shaka-player.ui.debug.js:39:120)\n    at $jscomp.asyncExecutePromiseGeneratorProgram (https://shaka-player-demo.appspot.com/dist/shaka-player.ui.debug.js:39:416)\n    at shaka.drm.DrmEngine.queryMediaKeys_ (https://shaka-player-demo.appspot.com/dist/shaka-player.ui.debug.js:663:101)"
}

[sojadhav]

Any update on this ?

[sojadhav]

Note : I tried with shaka player v4.14.0, Downloaded Angel One (multicodec, multilingual, Widevine), and it worked, I see release request for license once we remove offline content, same content not working with v4.15.7

[avelad]

@tykus160 It appears that commit fd7ee12 introduces this regression.