Amazon SNS access control use cases
You have a great deal of flexibility in how you grant or deny access to a resource. However, the typical use cases are fairly simple:
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You want to grant another AWS account a particular type of topic action (for example, Publish). For more information, see Grant AWS account access to a topic.
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You want to limit subscriptions to your topic to only the HTTPS protocol. For more information, see Limit subscriptions to HTTPS.
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You want to allow Amazon SNS to publish messages to your Amazon SQS queue. For more information, see Publish messages to an Amazon SQS queue.