The course of Multimedia Security describes briefly the multimedia contents, the industry and the threats, i.e. the problem of copyright protection in the Information Society. Digital contents or applications can be copied and distributed via communication networks at low cost (without cost). This damages the owners of these goods because a high number of users can access the contents or programs without compensating its rightful owner. This problem has been approached from two different viewpoints, but complementary; copy prevention and copy detection (illegal copy). The copy prevention includes technologies that do not allow accessing to content or applications to unauthorized users. Authorized users are those who have purchased a legitimate copy of the product (or the access to the product). The copy detection comprises the technologies allow to know who is the legitimate user (watermarking) or even prove who has redistributed the copy (Fingerprinting). In both cases, we must find the copy.
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