# Programming the AWS KMS API

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This page was generated from content adapted from the [AWS Developer Guide](https://github.com/awsdocs/aws-kms-developer-guide.git)
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## Working with grants

* **Note**\
  The `GranteePrincipal` field in the `ListGrants` response usually contains the grantee principal of the grant. However, when the grantee principal in the grant is an AWS service, the `GranteePrincipal` field contains the [service principal](https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_principal.html#principal-services), which might represent several different grantee principals.