What is Jazz Authentication Server(JAS)
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Starting with the CLM 6.0 software release, Jazz Security Architecture (JSA) SSO is available as an authentication option. Based on OpenID Connect , the authentication is not performed by the container hosting Jazz applications, but instead is delegated to a separate Jazz Authorization Server (JAS), which performs the role of an OpenID Connect provider (OP). JAS also provides Single Sign On feature to the applications that are configured with it.
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LDAP stores the user information/password etc. JAS connects to the LDAP and asked the LDAP if a users credentials are correct. It can also query for other user information stored in the LDAP. Typically an organisation uses an LDAP (like windows Active Directory or a linux LDAP) to store each uesrs details. You would use the JAS to connect to the LDAP so you do not need to maintain two sets of accounts.