cpix

Python library for working with CPIX 2.1 (DASH-IF Content Protection Information Exchange) documents

For more details on CPIX see:

• https://dashif.org/guidelines/
• https://dashif.org/wp-content/uploads/2016/11/DASH-IF-CPIX-v2-0.pdf
• https://github.com/Dash-Industry-Forum/CPIX/tree/v2.1-communityreview

Supported features

• Creation of CPIX documents
• Content keys
• Usage rules
• DRM systems
• Parsing of CPIX documents
• Validation against CPIX XSD

Not yet implemented

• Validation of document correctness (e.g. kid referenced by usage rule matches a content key)

Not supported

• Encryption, decryption and signing are not supported.

Installation

Install using pip:

pip install cpix

Examples

Scripts

Example scripts which can be used with Widevine and Playready test servers to get or create keys and produce CPIX documents are available in example.

Simple CPIX

To create a simple CPIX document with a single key:

import cpix

full_cpix = cpix.CPIX(
    content_keys=cpix.ContentKeyList(
        cpix.ContentKey(
            kid="0DC3EC4F-7683-548B-81E7-3C64E582E136",
            cek="WADwG2qCqkq5TVml+U5PXw=="
        )
    ),
    drm_systems=cpix.DRMSystemList(
        cpix.DRMSystem(
            kid="0DC3EC4F-7683-548B-81E7-3C64E582E136",
            system_id="EDEF8BA9-79D6-4ACE-A3C8-27DCD51D21ED",
            pssh=("AAAAxnBzc2gBAAAA7e+LqXnWSs6jyCfc1R0h7QAAAAINw+xPdoNUi4HnPGT"
                  "lguE2FEe37S9mVyu9EwbOfPNhDQAAAIISEBRHt+0vZlcrvRMGznzzYQ0SEF"
                  "rGoR6qL17Vv2aMQByBNMoSEG7hNRbI51h7rp9+zT6Zom4SEPnsEqYaJl1Hj"
                  "4MzTjp40scSEA3D7E92g1SLgec8ZOWC4TYaDXdpZGV2aW5lX3Rlc3QiEXVu"
                  "aWZpZWQtc3RyZWFtaW5nSOPclZsG")
        )
    )
)

This can then be printed as a formatted XML document:

print(str(full_cpix.pretty_print(xml_declaration=True), "utf-8'"))

<?xml version='1.0' encoding='utf-8'?>
<CPIX xmlns:pskc="urn:ietf:params:xml:ns:keyprov:pskc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:dashif:org:cpix" xsi:schemaLocation="urn:dashif:org:cpix cpix.xsd">
  <ContentKeyList>
    <ContentKey kid="0dc3ec4f-7683-548b-81e7-3c64e582e136">
      <Data>
        <pskc:Secret>
          <pskc:PlainValue>WADwG2qCqkq5TVml+U5PXw==</pskc:PlainValue>
        </pskc:Secret>
      </Data>
    </ContentKey>
  </ContentKeyList>
  <DRMSystemList>
    <DRMSystem kid="0dc3ec4f-7683-548b-81e7-3c64e582e136" systemId="edef8ba9-79d6-4ace-a3c8-27dcd51d21ed">
      <PSSH>AAAAxnBzc2gBAAAA7e+LqXnWSs6jyCfc1R0h7QAAAAINw+xPdoNUi4HnPGTlguE2FEe37S9mVyu9EwbOfPNhDQAAAIISEBRHt+0vZlcrvRMGznzzYQ0SEFrGoR6qL17Vv2aMQByBNMoSEG7hNRbI51h7rp9+zT6Zom4SEPnsEqYaJl1Hj4MzTjp40scSEA3D7E92g1SLgec8ZOWC4TYaDXdpZGV2aW5lX3Rlc3QiEXVuaWZpZWQtc3RyZWFtaW5nSOPclZsG</PSSH>
    </DRMSystem>
  </DRMSystemList>
</CPIX>