There are no such things as Azure Blob Storage today AWS IAM Policies for S3. Azure recently launched Role Based Access Control (RBAC)and is available for Azure Storage, but is limited to performing management actions only like creating storage accounts, etc. It is not yet available for performing data management actions, such as loading a blob, etc.
You can look Azure Rights Management Service (Azure RMS)and see if it is suitable for your needs. If you are looking for Azure RMS Blob, you will find one of the search result links in a PDF file that talks about protecting the blob repository with this service (the link directly downloads the PDF file and therefore I cannot include it here).
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