Amazon RDS for Oracle now supports the Oracle Label Security (OLS) option

You can now use the Oracle Label Security (OLS) option to control access to individual table rows in your Amazon RDS DB instances running Oracle 12c. With the Oracle Label Security option, you can enforce regulatory compliance with a policy-based administration model, and ensure that an access to sensitive data is restricted to only users with the appropriate clearance level. 
Quelle: aws.amazon.com