The course begins describing and characterizing multimedia contents, the related industry, and the associated threats, i.e. the problem of copyright protection in the Information Society. Then, we introduce the legal framework supporting Intellectual Property rights, Industrial Property rights, Copyright, and, as a related issue, Software Licenses. After the rights of the authors of multimedia content have been described, we will introduce Digital Rights Management tools, which are a collection of information security tools to manage the access rights to multimedia content. DRM tools can be categorized in two broad categories: copy protection tools and copy detection tools. - Copy protection tools include 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). As a special case, we will explore protection tools specific to software and videogames. - Copy detection tools comprise the technologies that allow content distributors to identify illegally distributed content (multimedia fingerprinting) and to know who the legitimate owner of the content is (watermarking).