Widevine license acquisition is failed with "persistentState:required" under Desktop Chrome.

[Alex Karlovich]

Hello,

We are using shaka player v.2.0.0 for dash streaming with the following configuration for the Widevine DRM:

'com.widevine.alpha': {

persistentStateRequired: true

}

This config is required to identify each unique device on license server side.

But the following error is appeared:

1. First request to the license server is ok, challenge body is full (Content-Length: 1767 Bytes) and license server returns correct license, playback successfully starts.

2. When user just reloads the page, the next license request contains practically empty challenge (Content-Length: 2 Bytes) and license acquisition flow is failed.

Does anybody have the such experience with "persistentState:required" & device identification? What could be wrong in our case?

Best regards,

Alex.

[Alex Lee]

The 2-byte license challenge is a Widevine certificate request, which enables persistentState.  Please make sure your license proxy send this small request (unsigned, unmodified) to the Widevine License Service for fulfillment.  The response metadata will indicate this is a certificate request type.

thanks,

Alex

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[Alex Karlovich]

Hi Alex,

Thanks a lot for the quick response,

I will provide this info to our BO engineers,

Best regards,

Sasha.

The 2-byte license challenge is a Widevine certificate request, which enables persistentState.  Please make sure your license proxy send this small request (unsigned, unmodified) to the Widevine License Service for fulfillment.  The response metadata will indicate this is a certificate request type.

thanks,

Alex

On Tue, Nov 8, 2016 at 8:49 AM, Alex Karlovich <alexka...@gmail.com> wrote:

Hello,

We are using shaka player v.2.0.0 for dash streaming with the following configuration for the Widevine DRM:

'com.widevine.alpha': {

persistentStateRequired: true

}

This config is required to identify each unique device on license server side.

But the following error is appeared:

1. First request to the license server is ok, challenge body is full (Content-Length: 1767 Bytes) and license server returns correct license, playback successfully starts.

2. When user just reloads the page, the next license request contains practically empty challenge (Content-Length: 2 Bytes) and license acquisition flow is failed.

Does anybody have the such experience with "persistentState:required" & device identification? What could be wrong in our case?

Best regards,

Alex.

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[Oleg T]

Hi Alex,

The 2-byte license challenge is a Widevine certificate request, which enables persistentState.  Please make sure your license proxy send this small request (unsigned, unmodified) to the Widevine License Service for fulfillment.  The response metadata will indicate this is a certificate request type.

Is this '2-byte' criteria is 100% reliable? We are going to implement the proxy exception for Widevine certificate request, as you proposed. But we need to make sure that we are using some criteria that proxy can safely rely on.

[Alex Lee]

Yes, something like under 10 bytes and if license response indicates a certificate type.

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