OpenAthens LA was our locally installed authentication product which connected to ActiveDirectory and used the user credentials you were already maintaining for authentication so you would not need to create or manage separate accounts. All support for it ends / ended on 31 March 2020. OpenAthens LA has been superseded by local connector functionality. See: About local directory integration.
Documentation for OpenAthens LA is currently available from: OpenAthens LA documentation
If you have further questions, your account manager or the service desk will be the best people to talk to.