SecuRich has not been updated since 2011.
Its main purpose is to emulate roles, but this feature has been supported in the server since MariaDB 10.0. However other interesting features are available via SecuRich, such as the ability to block a user, clone a user or set a password that will expire (also supported since MariaDB 10.4 - see User Password Expiry).
To use SecuRich features, its stored procedures should be used instead of the usual security-related SQL statements. For example, drop_user() should be used instead of DROP USER. However, if a combination of SecuRich procedure and normal SQL statements is used, SecuRich can reconcile its tables with the system tables.