# SPEKE API v1 - Standard payload components
<a name="standard-payload-components"></a>

In any SPEKE request, the encryptor can request responses for one or more DRM systems. The encryptor specifies the DRM systems in `<cpix:DRMSystemList>` of the request payload. Each system specification includes the key and indicates the type of response to return.

The following example shows a DRM system list with a single DRM system specification:

![\[RequestIntroSimple\]](http://docs.aws.amazon.com/speke/latest/documentation/images/RequestIntroSimple.png)


The following table lists the main components of each `<cpix:DRMSystem>`.


| Identifier | Description | 
| --- | --- | 
|   `systemId` or `schemeId`   |  Unique identifier for the DRM system type, as registered with the DASH IF organization. For a list, see [DASH-IF System IDs](https://dashif.org/identifiers/content_protection/).  | 
|   `kid`   |  The key ID. This is not the actual key, but an identifier that points to the key in a hash table.  | 
|   `<cpix:UriExtXKey>`   |  Requests a standard unencrypted key. The key response type must be either this or the `PSSH` response.  | 
|   `<cpix:PSSH>`   |  Requests a Protection System Specific Header (PSSH). This type of header contains a reference to the `kid`, the `systemID`, plus custom data for the DRM vendor, as part of Common Encryption (CENC). The key response type must be either this or the `UriExtXKey` response.  | 

\$1Example Requests for Standard Key and for PSSH \$1

The following example shows part of a sample request from the encryptor to the DRM key provider, with the main components highlighted. The first request is for a standard key, while the second request is for a PSSH response:

![\[RequestIntro1\]](http://docs.aws.amazon.com/speke/latest/documentation/images/RequestIntro1.png)


\$1Example Responses for Standard Key and for PSSH \$1

The following example shows the corresponding response from the DRM key provider to the encryptor:

![\[ResponseIntro1\]](http://docs.aws.amazon.com/speke/latest/documentation/images/ResponseIntro1.png)