This paper dealt with several security aspects in multimedia systems. The possible threads of various attacks are summarized and described. The methods focused on the intrusion detection and protection, the tools that manage the trusted use of digital media content (Digital Rights Management -DRM), as well as approaches for user's data privacy are also presented in the paper. Within HBB-Next architectural concept the Security Manager (SM) architectural component was proposed. This component is responsible for the management of multi-factor authentication, authorization, and policy enforcement for “multifactor levels” and for profile data access control.