This Bachelor thesis examines encryption methods that are used in IPTV-systems. The study also introduces the IPTV-system architecture. Both symmetrical and asymmetrical encryption methods and encryption key management are examined. Encryption is im-portant because it prevents illegal copying of valuable data. The IPTV-system uses an effi-cient encryption algorithm called Advanced Encryption Standard (AES). AES is a reliable encryption method.

Digital Rights Management (DRM) is also studied. DRM is a universal term for protection methods used in IPTV-systems. The IPTV system architecture is presented.