Overview

This tutorial walks through integrating Bitmovin CENC Encoding with DoveRunner CPIX DRM in TWO simple steps.

For a full working sample refer to the Appendix.

3 Minute Video Guide of Bitmovin CENC + DoveRunner CPIX Integration

Pre-requisites

1. CONTENT_ID ; your script can generate this id to uniquely identify each content.
2. DOVERUNNER_KMS_TOKEN ; to uniquely identify and protect your request to the DoveRunner KMS. For more information on how to generate the KMS token, take a look at DoveRunner's CPIX API Guide.

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Regarding DoveRunner's KMS

This tutorial uses DoveRunner's KMS version 2 as it supports Multi-Key encryption.

Applicable Use cases

1. Single Key for all renditions.
2. Multi-Key i.e. different keys for different renditions.

In this tutorial we will assume use case #2 (Multi-Key).

1. Get DRM information from DoveRunner

Overview

We'll be discussing Multi-Key integration (1 key for SD and 1 key for AUDIO). Implementation of the below logic can be found in the method _get_pallycon_drm_config @ cenc_drm_content_protection.py.

Steps

1. Get the values from the pre-requisites section and update them respectively.

CONTENT_ID = "CONTENT_ID"
PALLYCON_KMS_URL = "https://drm-kms.doverunner.com/v2/cpix/doverunner/getKey/"
PALLYCON_ENC_TOKEN = "DOVERUNNER_KMS_TOKEN"
# Request headers
headers = {'content-type': 'application/xml'}

2. Request DRM keys from DoveRunner. in this case it's been configured for the Fairplay, Widevine and Playready for 1 SD key and 1 AUDIO key.

a. `<cpix:ContentKey>` - 1 for each key. 
    a.1 In our use case there'd be two such elements
  b. `cpix:DRMSystem` - the different DRM systems i.e Widevine/Playready/Fairplay we are requesting for each key in #1. 
    b.1 In our usecase there'd be 6 elements (3 for the 1st key and 3 for the 2nd.)
  c. `cpix:ContentKeyUsageRule` - the intended track type (SD/HD/AUDIO) for each key
    c.1 In our usecase there'd be 2 such elements are we are requesting 1 key for `SD` and another for `AUDIO`

3. Parse the DoveRunner DRM response into the Pallycon_Drm_Config helper class.

2. Apply DoveRunner DRM using Bitmovin CENC API

1. After getting the DoveRunner DRM configs we first split the DRM config by tracks (SD, AUDIO).

    def get_drm_config_by_track(pallycon_drm_configs: typing.Dict, track: str) -> typing.Dict:
        return dict(filter(lambda elem: (elem[1]).get_track() == track,pallycon_drm_configs.items()))
    pallycon_drm_configs = _get_pallycon_drm_config()
    audio_drm_configs = get_drm_config_by_track(pallycon_drm_configs, "AUDIO")
    sd_drm_configs = get_drm_config_by_track(pallycon_drm_configs, "SD")

2. Lastly we apply the Pallycon_Drm_Config and create the DRM Muxing by using the method _create_drm_config @ cenc_drm_content_protection.py.

FAQ

Question: Exception in _get_pallycon_drm_config @ cenc_drm_content_protection.py

Answer: This could be due to one of the following:

1. Expired DoveRunner DRM token; or—
2. Invalid request body.

Check with DoveRunner Support for more details.

Appendix

Working Source code

1. Clone the Bitmovin GitHub repository.
2. use this updated cenc_drm_content_protection_v1.2 file with the DoveRunner integration in place of the GitHub sample.

Additional reads

Review DoveRunner's Bitmovin Encoder Integration Guide to learn more about:

1. The underpinnings of the SPEKE integration; or—
2. The CENC integration option.