Audio watermarking

Recent Trends in Communication Networks Online Course https://giladjames.com Section: A Survey on Piracy Protection Techniques in Digital Cinema Watermarking Schemes Lesson: Audio watermarking Introduction Digital distribution has been considered by researchers since four decades ago. With the growth of available bandwidth in the telecommunications infrastructures, it gradually appeared as one of the main purposes of communication during two decades. This encouraged a lot of research on different aspects of digital distribution over internet. Digital distribution brings about several challenges among which one can refer to performance, but in this lecture, we are more interested in security. Security of digital distribution has been investigated from different aspects. One of the most challenging aspects in digital distribution security is digital rights management, which has been the topic for several research works. With the emergence of internet, online digital distribution found its applications in a variety of environments. Meanwhile, the public access to internet made security more and more challenging . Content delivery is a branch of digital distribution, which is growing very fast in different aspects. The more content delivery systems grow, the more complex security their security management becomes. Among advances in content delivery, one may mention CDNs. These networks serve to high-performance delivery of digital contents as well as streaming of audio and video in collaboration with other technologies such as cloud computing. Different aspects of security in CDNs such as privacy , digital property management , intrusion detection , trust , and eavesdropping protection have been studied by researchers. Digital cinema is a service that can be provided using CDNs. It is an online video streaming and projection service gaining a research focus in recent years. Security is a serious challenge in digital cinema like other services provided over CDNs. One of the most important aspects of digital cinema security is digital rights management , which is about preserving the publication rights for the generator of contents. Counterfeit protection is one of the most challenging problems in the area of digital cinema rights management. Digital property management and especially counterfeit protection mostly depend on watermarking in a variety of environments. Digital watermarking has been finding its applications in digital cinema in recent years. But, there is a delicate challenge faced by watermarking systems used in digital cinema. In the absence of proper protective measures, counterfeit copies of movies can be recorded by handheld cameras in the cinema hall. Movie theater holders are obliged to take preventive measures in this regard. This creates two problems, which need to be taken into consideration while designing watermarking schemes for digital cinema. These problems are explained in the following. The first problem is faced by movie providers. When a pirate copy is distributed, providers would like to identify the theatre where the copy has been recorded. Then they can sue the identified theatres as they have not fulfilled their legal obligations. One way to approach this problem is to add watermarks to the movie by the projector in projection time. This watermark carries some identification information about the cinema hall as well as the projection time. This makes it possible to identify the hall in which a counterfeit copy has been recorded. But, the distortions made by hand vibrations and point of view angle, makes it difficult to recover the watermark from the movie. Thus, watermarking schemes designed for digital cinema should be specifically resistant against these distortions. The second problem is to locate the seat on which the camcorder has been recording. This problem is to be solved by cinema holders as they are legally responsible for illegally recorded copies. Solving this problem requires digital cinema watermarking schemes to be able to calculate distance and angle. There are some surveys on techniques used to solve the two problems mentioned above. But, they are outdated for such a f #recent #trends #in #communication #networks