shaka-player/docs/tutorials/drm-config.md

# DRM Configuration

#### NOTE: EME and http URLs

EME requires a secure URL to use.  This means you have to use `https` or be on
`localhost`.  Currently only Chrome enforces it, but other browsers will in the
future.  Also, because of mixed content requirements, if your site is using
`https`, then your manifest and every segment will also need to use `https` too.

See: Chrome's [announcement][], Firefox's [intent to remove][firefox_bug], and
how to [disable for testing][allow_http].

[allow_http]: https://www.chromium.org/Home/chromium-security/deprecating-powerful-features-on-insecure-origins
[announcement]: https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/tXmKPlXsnCQ/ptOETCUvBwAJ
[firefox_bug]: https://bugzilla.mozilla.org/show_bug.cgi?id=1322517


#### License Servers

Without DRM configuration, Shaka only plays clear content.  To play protected
content, the application only needs to tell Shaka one basic thing: the URL(s)
of its license server(s).

We've made this simple through `player.configure()`.  The field `drm.servers` is
an object mapping key system IDs to server URLs.  For example, to set license
servers for both Widevine and Playready:

```js
player.configure({
  drm: {
    servers: {
      'com.widevine.alpha': 'https://foo.bar/drm/widevine',
      'com.microsoft.playready': 'https://foo.bar/drm/playready'
    }
  }
});
```

Assuming your manifest uses the standard UUIDs for those key systems, that's
all you need to do.


#### Choosing a Key System

Shaka Player is key-system-agnostic, meaning we don't prefer any key systems
over any others.  We use EME to ask the browser what it supports, and make no
assumptions.  If your browser supports multiple key systems, the first supported
key system in the manifest is used.

The interoperable encryption standard that DRM vendors are implementing is
called Common Encryption (CENC).  Some DASH manifests don't specify any
particular key system at all, but instead state that any CENC system will do:

```xml
<ContentProtection schemeIdUri="urn:mpeg:dash:mp4protection:2011" value="cenc"/>
```

If this is the only `<ContentProtection>` element in the manifest, Shaka will
try all key systems it knows. (Based on keySystemsByURI in
{@linksource shaka.extern.DashManifestConfiguration}.)

Through `player.configure()`, you can update the dash key systems mapping by
scheme URI:

```js
player.configure({
  manifest: {
    dash: {
      keySystemsByURI: {
        'urn:uuid:9a04f079-9840-4286-ab92-e65be0885f95': 'com.microsoft.playready.recommendation',
        'urn:uuid:79f0049a-4098-8642-ab92-e65be0885f95': 'com.microsoft.playready.recommendation',
      }
  }
  }
});
```

If the browser supports it and you configured a license server URL for it, we'll
use it.

Alternative there are a config for make a mapping of keysystem if you know that
is broadly supported. For example, `com.microsoft.playready.recommendation`:

```js
player.configure({
  drm: {
    keySystemsMapping: {
      'com.microsoft.playready': 'com.microsoft.playready.recommendation',
    }
  }
});
```

With the previous configuration you will choose the `recommendation` keySystem
when your manifest (HLS or DASH) uses PlayReady.


#### Clear Key

The EME spec requires browsers to support a common key system called "Clear
Key".  *(At the time of this writing (April 2016), only Chrome and Firefox
have implemented "Clear Key".)*
Clear Key uses unencrypted keys to decrypt CENC content, and can be useful
for diagnosing problems and testing integrations.  To configure Clear Key,
use the configuration field `drm.clearKeys` and provide a map of key IDs to
content keys (both in hex):

```js
player.configure({
  drm: {
    clearKeys: {
      // 'key-id-in-hex': 'key-in-hex',
      'deadbeefdeadbeefdeadbeefdeadbeef': '18675309186753091867530918675309',
      '02030507011013017019023029031037': '03050701302303204201080425098033'
    }
  }
});
```

This will force the use of Clear Key for decryption, regardless of what is in
your manifest.  Use this when you need to confirm that your keys are correct.


#### Clear Key Licenses

If your manifest actually specifies Clear Key, you can also use the normal
license request mechanism to retrieve keys based on key IDs.  The EME spec
defines a JSON-based [license request format] and [license format] for the
Clear Key CDM.  If you have a server that understands these, just configure
a license server as normal:

```js
player.configure({
  drm: {
    servers: {
      'org.w3.clearkey': 'http://foo.bar/drm/clearkey'
    }
  }
});
```

[license request format]: https://w3c.github.io/encrypted-media/#clear-key-request-format
[license format]: https://w3c.github.io/encrypted-media/#clear-key-license-format


#### Advanced DRM Configuration

We have several {@link shaka.extern.AdvancedDrmConfiguration advanced options}
available to give you access to the full EME configuration.  The config field
`drm.advanced` is an object mapping key system IDs to their advanced settings.
For example, to require hardware security in Widevine:

```js
player.configure({
  drm: {
    servers: {
      'com.widevine.alpha': 'https://foo.bar/drm/widevine'
    },
    advanced: {
      'com.widevine.alpha': {
        'videoRobustness': 'HW_SECURE_ALL',
        'audioRobustness': 'HW_SECURE_ALL'
      }
    }
  }
});
```

If you don't need them, you can leave these at their default settings.


#### Robustness

Robustness refers to how securely the content is handled by the key system. This
is a key-system-specific string that specifies the requirements for successful
playback.  Passing in a higher security level than can be supported will cause
`player.load()` to fail with `REQUESTED_KEY_SYSTEM_CONFIG_UNAVAILABLE`.  The
default is the empty string, which is the lowest security level supported by the
key system.

Each key system has their own values for robustness.

##### Widevine

Chromium sources: https://cs.chromium.org/chromium/src/components/cdm/renderer/widevine_key_system_properties.h?q=SW_SECURE_CRYPTO&l=22

- `SW_SECURE_CRYPTO`
- `SW_SECURE_DECODE`
- `HW_SECURE_CRYPTO`
- `HW_SECURE_DECODE`
- `HW_SECURE_ALL`

##### PlayReady

Microsoft Documentation: https://docs.microsoft.com/en-us/playready/overview/security-level

- `3000`
- `2000`
- `150`

`com.microsoft.playready` key system ignores given robustness and stays at a
`2000` decryption level.

NB: Audio Hardware DRM is not supported (PlayReady limitation)

##### FairPlay

Based on [Apple's Documentation](https://developer.apple.com/streaming/fps/),
you should provide an empty string as robustness

##### Other key-systems

Values for other key systems are not known to us at this time.

#### Re-use persistent license DRM for online playback

If your DRM provider configuration allows you to deliver persistent license,
you could re-use the created MediaKeys session for the next online playback.

Configure Shaka to start DRM sessions with the `persistent-license` type
instead of the `temporary` one:

```js
player.configure({
  drm: {
    advanced: {
      'com.widevine.alpha': {
        'sessionType': 'persistent-license'
      }
    }
  }
});
```

**Using `persistent-license` might not work on every devices, use this feature
carefully.**

When the playback starts, you can retrieve the sessions metadata:

```js
const activeDrmSessions = this.player.getActiveSessionsMetadata();
const persistentDrmSessions = activeDrmSessions.filter(
  ({ sessionType }) => sessionType === 'persistent-license');

// Add your own storage mechanism here, give it an unique known identifier for
// the playing video
```

When starting the same video again, retrieve the metadata from the storage, and
set it back to Shaka's configuration.

Shaka will load the given DRM persistent sessions and will only request a
license if some keys are missing for the content.

```js
player.configure({
  drm: {
    persistentSessionOnlinePlayback: true,
    persistentSessionsMetadata: [{
      sessionId: 'deadbeefdeadbeefdeadbeefdeadbeef',
      initData: new InitData(0),
      initDataType: 'cenc'
    }]
  }
});
```

NB: Shaka doesn't provide a out-of-the-box storage mechanism for the sessions
metadata.

#### Continue the Tutorials

Next, check out {@tutorial license-server-auth}.
Or check out {@tutorial fairplay}.