# Enhancing Amazon SNS security with Message Data Protection
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**Important**  
Amazon SNS message data protection is no longer available to new customers. For more information and guidance on alternatives, see [Amazon SNS message data protection availability change](https://docs.amazonaws.cn/sns/latest/dg/sns-message-data-protection-availability-change.html).
+ [Message Data Protection](message-data-protection.md) is a feature in Amazon SNS used to define your own rules and policies to audit and control the content for data in motion, as opposed to data at rest.
+ Message Data Protection provides governance, compliance, and auditing services for enterprise applications that are message-centric, so data ingress and egress can be controlled by the Amazon SNS topic owner, and content flows can be tracked and logged.
+ You can write payload-based governance rules to stop unauthorized payload content from entering your message streams.
+ You can grant different content-access permissions to individual subscribers, and audit the entire content-flow process.