Overriding the key identifier - Secure packager and encoder key Exchange API specification

Overriding the key identifier

The encryptor creates a new key identifier (KID) each time that it rotates keys. It passes the KID to the DRM key provider in its requests. Almost always, the key provider responds using the same KID, but it can provide a different value for the KID in the response.

The following is an example request with the KID 11111111-1111-1111-1111-111111111111:

<cpix:CPIX id="abc123" xmlns:cpix="urn:dashif:org:cpix" xmlns:pskc="urn:ietf:params:xml:ns:keyprov:pskc" xmlns:speke="urn:aws:amazon:com:speke"> <cpix:ContentKeyList> <cpix:ContentKey kid="11111111-1111-1111-1111-111111111111"></cpix:ContentKey> </cpix:ContentKeyList> <cpix:DRMSystemList> <!-- Common encryption (Widevine)--> <cpix:DRMSystem kid="11111111-1111-1111-1111-111111111111" systemId="edef8ba9-79d6-4ace-a3c8-27dcd51d21ed"> <cpix:PSSH /> </cpix:DRMSystem> </cpix:DRMSystemList> <cpix:ContentKeyPeriodList> <cpix:ContentKeyPeriod id="keyPeriod_0909829f-40ff-4625-90fa-75da3e53278f" index="1" /> </cpix:ContentKeyPeriodList> <cpix:ContentKeyUsageRuleList> <cpix:ContentKeyUsageRule kid="11111111-1111-1111-1111-111111111111"> <cpix:KeyPeriodFilter periodId="keyPeriod_0909829f-40ff-4625-90fa-75da3e53278f" /> </cpix:ContentKeyUsageRule> </cpix:ContentKeyUsageRuleList> </cpix:CPIX>

The following response overrides the KID to 22222222-2222-2222-2222-222222222222:

<cpix:CPIX xmlns:cpix="urn:dashif:org:cpix" xmlns:pskc="urn:ietf:params:xml:ns:keyprov:pskc" xmlns:speke="urn:aws:amazon:com:speke" id="abc123"> <cpix:ContentKeyList> <cpix:ContentKey explicitIV="ASgwx9pQ2/2lnDzJsUxWcQ==" kid="22222222-2222-2222-2222-222222222222"> <cpix:Data> <pskc:Secret> <pskc:PlainValue>p3dWaHARtL97MpT7TE916w==</pskc:PlainValue> </pskc:Secret> </cpix:Data> </cpix:ContentKey> </cpix:ContentKeyList> <cpix:DRMSystemList> <cpix:DRMSystem kid="22222222-2222-2222-2222-222222222222" systemId="edef8ba9-79d6-4ace-a3c8-27dcd51d21ed"> <cpix:PSSH>AAAAanBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAAEoIARIQeSIcblaNbb7Dji6sAtKZzRoNd2lkZXZpbmVfdGVzdCIfa2V5LWlkOmVTSWNibGFOYmI3RGppNnNBdEtaelE9PSoCU0QyAA==</cpix:PSSH> </cpix:DRMSystem> </cpix:DRMSystemList> <cpix:ContentKeyPeriodList> <cpix:ContentKeyPeriod id="keyPeriod_0909829f-40ff-4625-90fa-75da3e53278f" index="1" /> </cpix:ContentKeyPeriodList> <cpix:ContentKeyUsageRuleList> <cpix:ContentKeyUsageRule kid="22222222-2222-2222-2222-222222222222"> <cpix:KeyPeriodFilter periodId="keyPeriod_0909829f-40ff-4625-90fa-75da3e53278f" /> </cpix:ContentKeyUsageRule> </cpix:ContentKeyUsageRuleList> </cpix:CPIX>