Your network contains an Active Directory forest named adatum.com. The forest contains an Active Directory Rights Management Services (AD RMS) cluster.
A partner company has an Active Directory forest named litwareinc.com. The partner company does not have AD RMS deployed.
You need to ensure that users in litwareinc.com can consume rights-protected content from adatum.com.
Which type of trust policy should you create?
A. At federated trust
B. A trusted user domain
C. A trusted publishing domain
D. Windows Live ID
In AD RMS rights can be assigned to users who have a federated trust with Active Directory Federation Services (AD FS). This enables an organization to share
access to rights-protected content with another organization without having to establish a separate Active Directory trust or Active Directory Rights Management
Services (AD RMS) infrastructure.
Reference: AD RMS and AD FS Considerations