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With Azure Data Lake Storage Gen2 it is finer grain security model. The Azure Data Lake Storage Gen2 access control model supports both Azure role-based access control (Azure RBAC) and Portable Operating System Interface for UNIX (POSIX) access control lists (ACLs). There are also a few extra security settings that are specific to Azure Data Lake Storage Gen2. You can set permissions either at the directory level or at the file level. All stored data is encrypted at rest by using either Microsoft-managed or customer-managed encryption keys.
For details, see Authorize access to Azure Blob Storage using Azure role assignment conditions and Use the Azure portal to manage ACLs in Azure Data Lake Storage Gen2
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