本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

# SPEKE API v1 - 覆寫金鑰識別符
<a name="kid-override"></a>

加密程式會在每次輪換金鑰時建立新的金鑰識別符 (KID)。它會在請求中將 KID 傳遞到 DRM 金鑰提供者。金鑰提供者通常會使用相同的 KID 進行回應，但它可以為回應中的 KID 提供不同的值。

下列是 KID 的範例請求 `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>
```

下列回應會將 KID 覆寫為 `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>
```