The Office Live Meeting client has been designed with the following security-related considerations.

The files in the installation package are protected from tampering by using digital signatures.

Office Live Meeting uses Secure Real-time Transport Protocol (SRTP) to transport audio and video.

The Office Live Meeting client installer adds the Office Live Meeting client to the Windows Firewall exceptions list. Uninstalling the client removes this exception from Windows Firewall.

The following registry key can be used to prevent the user from joining Office Communications Server meetings as an anonymous user.

The default setting for this registry key is 1, which allows a user to join Office Communications Server meetings as an anonymous user. This means that if the user is not authenticated with his or her SIP URI, the user can join a meeting by using the meeting entry code. By setting this registry key to 0, users are prevented from being able to join a meeting unless they are authenticated with an SIP URI.

This setting is useful in organizations that want to limit users to Office Live Meeting meetings in which the user is authenticated. Users can only participate in meetings that are hosted by their own organization or federated organizations.

The following registry key can be used to prevent users from joining meetings that are hosted on the Office Live Meeting service.

The default value for this setting is 1, which allows users to join Office Live Meeting service meetings. Because meetings that are hosted on the Office Live Meeting service do not require users to be authenticated with a SIP URI and only require an entry code, some organizations may want to prevent users from joining these meetings for security reasons. To prevent users from being able to join Live Meeting service meetings, organizations can set this registry key to 0.