What are the primary differences between the OBIEE 10g and 11g security models

What are the primary differences between the OBIEE 10g and 11g security models and what happens during upgrade?

Security Task/Object	OBIEE 10g	OBIEE 11g	What happens during upgrade from 10g to 11g?
Define Users and Groups in RPD file using OBIEE Admin Tool	Default	N/A. By default, users are defined in embedded WLS LDAP via FMW EM Console, or alternatively, in external LDAP.	By default, existing users and groups migrated to embedded WLS LDAP. Existing groups are automatically mapped to an Application role.
Defining security policies	Policies in the catalog and repository can be defined to reference groups within a directory.	Policies are defined in terms of application roles, which map to users and groups in a directory.	10g catalog groups are automatically migrated in the upgraded catalog and assigned the same privileges, access and membership.
“Administrator” user	Unique user with full administrative privileges.	No single user named tor full administrative privileges. Administration can be performed by any user who is member of BIAdministrators group.	“Administrator” user automatically added as member of “BIAdministrators” group in embedded WLS LDAP and granted Administrator role. The user specified during OBIEE 11g installation (i.e. “weblogic”, “biadmin”) is also a member of the BIAdministrators group.
Repository Encryption	Available on sensitive elements only - i.e. user passwords, connection pool passwords, etc.	Entire RPD encrypted via a password.	Prompted to set a repository password while running the upgrade assistant. Do not lose this password as there is no feature to recover a lost password.
External Authentication and OBIEE Initialization (Init) Blocks	Init blocks are requiredfor external PDAP or external table authentication.	Init blocks not required for WLS embedded LDAP. Init blocks are required for external LDAP or external table authentication.	Upgraded RPD will continue to point to 10g LDAP or external tables. Initblocks may need to be modified to ensure that depreciated, or reserved word, variable names are renamed. NOTE: If you intend to use another LDAP server, such at Oracle Identity Management (OID), then you must upgrade to the embedded LDAP server. Please see Upgrade Guide for further details.
Catalog Groups	Defined in Presentation Server Administration link	Available for backward compatibility. Use of Application Roles in FMW EM Console recommended.	Existing groups will be migrated. Recommendation is to use application roles instead. Privileges on catalog objects may be granted to an application role via BI Presentation server Administration link.
SA System Subject Area	Optional	Available for backward compatibility and requires init blocks and external tables. Use of Embedded LDAP is recommended.	Upgraded 10g RPD will point to external tables, Initblocks may need to be modified to ensure that depreciated, or reserved word, variable names are renamed.
“Everyone” Presentation Server Group	Default	Replaced with AuthenticatedUser role.	“Everyone” group migrated to AuthenticatedUser role.