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Apparently this doesn't include the version that comes with data at rest encryption (10.1.3):

RDS MariaDB already supports encryption at rest, so you don't need to wait for 10.1: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Overvi...

MariaDB 10.1 is not a GA release, yet. When it goes GA, presumably this will also be available on RDS. Currently 5.5 & 10.0 are GA releases.