DRM System Research Articles

Quantum-secure content key delivery mechanism for DRM system

Quantum-secure content key delivery mechanism for DRM system

Enhancing security of biometrics based authentication framework for DRM system

Enhancing security of biometrics based authentication framework for DRM system

Methods of implementation and operation of hardware DRM protection on the example of printer cartridges

The subject of this paper is to analyze the way of implementation and operation of hardware DRM protection systems on the example of selected printer cartridges. Thanks to the analysis, it is possible to understand the way of operation of typical security chips used in printer cartridges. Using the knowledge gained, it becomes possible to modify the data on the security chips and thus reset the protection, so that the printer sees the chip with the modified data as a new one. However, the process itself was difficult due to the lack of publicly available materials on this topic. In this paper, different approaches to DRM security analysis have been used, so that the reader can try to perform the described steps to analyze other hardware DRM systems by himself. In addition, devices called resetters have been designed and fabricated to quickly reset the analyzed security chips. Their design and documentation is available on the author's Github.

Block Diagram of the DRM Simulcast Trial Equipment Configuration in FM Band

The article describes the current state of Russian radio broadcasting industry, study and implementation of block diagram of the DRM Simulcast trial equipment configuration in FM band, based on the carried out a highpower field trial of the DRM system in DRM Simulcast mode during 2019 to 2020. Recommendations for DRM digital broadcasting system implementation during the transitional period in the VHF band in the Russian Federation is presented.

К вопросу об использовании технологии блокчейн в DRM-системах для защиты авторского права программного обеспечения

К вопросу об использовании технологии блокчейн в DRM-системах для защиты авторского права программного обеспечения

Direct tolerance analysis of mechanical assemblies with normal and non-normal tolerances for predicting product quality

ABSTRACT Tolerance analysis, as an effective tool for predicting the effects of geometrical and dimensional deviations on the key characteristics, plays an essential role in increasing the functionality and quality of mechanical products. The conventional methods in the literature have been developed based on this main assumption that the assembly function is available in an explicit form. However, in most industrial applications, deriving an assembly function in an explicit form may be difficult if not impossible. On the other hand, one of the major weaknesses of the conventional tolerance analysis methods in the literature is that all effective dimensions should be varied under the normality assumption. To overcome these weaknesses, in this paper, a new tolerance analysis approach is developed based on the univariate DRM and Pearson system concepts. The proposed method can analyze directly without the need to define any assembly function and also the rejected product rate can be easily predicted using evaluations of the assembly dimension at the limited number of special points. Finally, for verification of the proposed method, some illustrative case studies are considered and results are compared to obtained results of the Monte-Carlo Simulations and the improved Hassofer-Lind and Rack-Fizzler reliability index methods.

The Levitation of Copyright: An Economic View of Digital Home Copying, Levies and DRM

Many European countries introduced a levy scheme in order to compensate rightholders for the losses suffered through home copying. The Copyright Directive of 2001, however, appears to require them to abolish levy schemes as regards private copying that can technologically be controlled by way of DRM systems. This contribution assesses the merits of this approach, mainly from an economic point of view. Is direct control over private copying preferable to a levy scheme? It is concluded that economic theory cannot provide a clear-cut answer to this question. Arguments can be made both in favor and against maintaining the levy system.

Влияние алгоритмов компрессии контент-сервера системы DRM на качество передаваемых звуковых программ

This work studied the influence of MPEG-4 HE-AAC v.2 and MPEG-4 xHE-AAC compression algorithms on the reproduction performance of high-quality audio signals. The first part of the article is based on the analysis of earlier publications, studied quality of the compression algorithms for MPEG-4 ISO/IEC 14493-3 (AAC, AAC+SBR, PS, AAC+SBR+PS) and MPEG D Surround standards applied in MPEG-4 HE-AAC v.2 and MPEG-4 xHE-AAC codecs of DAB and DRM systems for digital audio broadcasting, respectively. It has been demonstrated that their use for processing of high-quality audio signals in the frequency range of 40…15000 Hz, allowed to reduce the digital-data rate at the output to 24…30 кbit/s, without observing noticeable phenomena. This conclusion was confirmed in the second part of the article, which described the results of relative comparison of the quality of reproduction of audio signals broadcasted via analogues FM or digital DRM channels. The equipment employed for their realization was described, as well as the methodology to obtain test recordings in order to perform the statistical data analysis. Further, the specific data scales were shown to evaluate the signal pairs being compared. Results of the experiments and their analysis confirmed that, for a digital data rate of 30 кbit/s obtained at the output of the MPEG-4 xHE-AAC coder, the difference in quality was rather weak for audio signals ranging from 40 to 15000 Hz, broadcasted via both analogues and digital channels. In addition, only a marginal difference was noticed for the signal pairs received from the digital output channels of the transmitter processor and DRM receiver. It has been demonstrated that the MPEG-4 xHE-AAC codec, compared to the previous MPEG-4 HE-AAC v.2 version, exhibited clear advantages for practical applications in terms of sound quality. Based on the gained experience, common criteria of deterioration of the data quality were formulated and generalized for all audio compression MPEG standards.

Modified DRM+ signal generation algorithm with reduced crest factor

To reduce the crest factor in the DRM+ system due to the limitations imposed by the standard the peak limiting method (clipping) and the window weighting method, which are based on signal distortion, are widely used. As a result of the application of these methods out-of-band emissions in the signal spectrum significantly increase. After filtering out-of-band emissions the effect of a repeated increase in the crest factor appears. In this regard, there is an urgent scientific and technical problem of finding the optimal method for filtering out-of-band emissions of the DRM+ signal. The purpose of this article is to analyze the existing methods for filtering out-of-band emissions in the process of reducing the crest factor in a DRM system, as well as choosing the optimal filtering algorithm after reducing the crest factor for DRM+ transmitters. A method for suppressing out-of-band emissions using a digital filter based on FFT / IFFT is considered. The modeling of the proposed algorithm for filtering the signal by the mask of out-of-band emissions is carried out. Comparative studies of the method of the standard filtering algorithm and the proposed algorithm are carried out; the high efficiency of the latter is shown. The results obtained will improve the efficiency of reducing the crest factor in broadcasting transmitters of the DRM + standard, thereby increasing their power efficiency.

Análisis de calidad de servicio en la transmisión por AM digital mediante el uso de códecs en USRP.

El objetivo fue realizar el estudio y análisis de la calidad de servicio en la transmisión am digital mediante el uso de códecs en USRP. La Metodología de desarrollo muestra claramente cómo se realizó el prototipo para la transmisión y recepción, empezando con la selección de dispositivos, el diseño, la ejecución y el análisis de los resultados obtenidos. Se basa en el estudio de las condiciones particulares en la transmisión y recepción de señal en AM digital (DRM), la implementación del transmisor en GNU Radio, la configuración del receptor en HDSDR y Dream SDR. Además de las tarjetas Ettus USRP N210, Ettus USRP B200 y RTL-SDR REALTEK RTL2832U. El resultado de este estudio fue la calidad de los niveles de servicio evaluados en la velocidad de transmisión (Kbps) y la relación señal / ruido (SNR) para determinar la fidelidad en la recepción de señales digitales. En base a los resultados se define que las características de funcionamiento de cada modo de robustez para un determinado canal de transmisión varían los valores de la velocidad de transmisión y la relación señal a ruido, ofreciendo el modo B una mejor protección de la señal con respecto al ruido, mientras que el modo A ofrece mayor velocidad de transmisión. El sistema DRM emplea las mejores tecnologías de compresión de sonido ya que usa los algoritmos de audio y voz del MPEG-4 que brinda excelente calidad de sonido a bajas tasas de bit como la codificación AAC.

Joint Estimation of Symbol Timing and Sampling Frequency Offset for CDD-OFDM-Based DRM Systems

In this paper, an efficient symbol timing offset (STO) and sampling frequency offset (SFO) estimation scheme is proposed in an orthogonal frequency division multiplexing-based digital radio mondiale system using cyclic delay diversity. By using a periodic nature of channel transfer function, cyclic delay and pilot pattern with a maximum channel power are chosen, which aids to enable a robust estimation of STO and SFO against frequency selectivity of the channel. As a performance measure, the mean squared error of the proposed scheme is theoretically derived and is verified through simulations. By simulation results, the proposed estimation scheme is proved to profit from properly selected cyclic delay and pilot pattern, with a superior performance over the conventional estimation scheme.

An improved E-DRM scheme for mobile environments

With the rapid development of information science and network technology, Internet has become an important platform for the dissemination of digital content, which can be easily copied and distributed through the Internet. Although convenience is increased, it causes significant damage to authors of digital content. Digital rights management system (DRM system) is an access control system that is designed to protect digital content and ensure illegal users from maliciously spreading digital content. Enterprise Digital Rights Management system (E-DRM system) is a DRM system that prevents unauthorized users from stealing the enterprise's confidential data. User authentication is the most important method to ensure digital rights management. In order to verify the validity of user, the biometrics-based authentication protocol is widely used due to the biological characteristics of each user are unique. By using biometric identification, it can ensure the correctness of user identity. In addition, due to the popularity of mobile device and Internet, user can access digital content and network information at anytime and anywhere. Recently, Mishra et al. proposed an anonymous and secure biometric-based enterprise digital rights management system for mobile environment. Although biometrics-based authentication is used to prevent users from being forged, the anonymity of users and the preservation of digital content are not ensured in their proposed system. Therefore, in this paper, we will propose a more efficient and secure biometric-based enterprise digital rights management system with user anonymity for mobile environments.

A novel DRM scheme for accommodating expectations of personal use

The existing DRM systems address the interests of providers, associated with prohibitively tight protection measures, which do not take customers’ behaviors and needs into account. This paper proposes a novel DRM scheme that both accommodates consumers’ expectations for the friendliness of personal use and preserves the providers’ revenue. By maintaining a fairer balance between the interests of both content providers and consumers, the proposed DRM scheme thus benefits the digital content industry as a whole. The comparison between the related works and the proposed scheme implies the superiority of the proposed scheme while the security analyses and the further discussion demonstrate the proposed works well.

A DRM Solution for Online Content Using Blockchain - A Music Perspective

The amount of piracy in the streaming and static digital content in general and the music industry in specific is posing a challenge to digital content owners. The paper proposes a DRM system to monetize, track and control online content cross platforms. The system addresses the need to lowering the barriers of entry for music bands, content reconciliation for royalty payments, and controlling the content after dissemination. The paper benefits from the current advances in Blockchain and cryptocurrencies. In specific, the paper presents a digital currency (Asset Assertion (AA) Token) on a permission based Blockchain to enable the secure dissemination and tracking of the digital content. The paper presents the model, as well as its information schematics. The proposed solution provides the data owner the ability to control the flow of information even after she releases it, by creating a secure, self-installed, cross platform reader located on the digital content file header.

A proxy broadcast re-encryption for cloud data sharing

Proxy re-encryption (PRE) enables a semi-trusted proxy to automatically convert a delegator’s ciphertext to a delegate’s ciphertext without learning anything about the underlying plaintext. PRE schemes have broad applications, such as cloud data sharing systems, distributed file systems, email forward systems and DRM systems. In this paper, we introduced a new notion of proxy broadcast re-encryption (PBRE). In a PBRE scheme, a delegator, Alice, can delegate the decryption right to a set of users at a time, which means that Alice’s ciphertext can be broadcast re-encrypted. We propose a PBRE scheme and prove its security against a chosen-ciphertext attack (CCA) in the random oracle model under the decisional n-BDHE assumption. Furthermore, our scheme is collusion-resistant, which means the proxy cannot collude with a set of delegates to reveal the delegator’s private key.

Frequency Acquisition Algorithm for DRM Receiver

In this paper we propose a frequency acquisition algorithm for DRM receiver . Given the parameters of the DRM system and the properties of PC hardware, the requirements for the frequency acquisition are analyzed. Following these requirements an acquisition algorithm using the FFT based on pilot is proposed. This algorithms utilize the continuous frequency correction pilot tones in the DRM signal. Simulation results on different fading channels show that the synchronization scheme suits our needs.

Content sharing schemes in DRM systems with enhanced performance and privacy preservation

Content sharing schemes in DRM systems with enhanced performance and privacy preservation

A General Encryption Algorithm for Different Format Videos

With the rapid development of social network, more and more information is being presented in the form of multimedia, so the security of multimedia files, especially video files, has been capturing the attention of the researchers. Video encryption is widely applied to the DRM system, video conference, medical and military fields and so on. A general video encryption algorithm is proposed to solve the problem that the existing multiple formats (compression formats and container formats) of video requires a unified encryption scheme. Meanwhile, the proposed scheme can not only provide variable levels of security, but also have good performance of compression efficiency and computational complexity, which can ensure that the encrypted video data can be operation.

Secure Anonymously Authenticated and Traceable Enterprise DRM System

Anonymity is one of the important services that must be available to users in the digital world as long as they behave honestly. Users’ communication must be kept authenticated and anonymous unless malicious behaviors are detected. In this case the accused user’s clear identity must be traced and revealed by the system to solve accusations. Enterprise Digital Rights Management (E-DRM) protects business digital applications by allowing an author in an organization to securely upload his confidential package/file(s) and store the contents in a private way on secure servers. This is done in a way that – later – allows an authorized user who is able to prove his authorization for the package to an authorization authority to download and use these contents in a private way. In this paper, we extend our previously proposed E-DRM protocols and propose an E-DRM protocol that allows authorized users to upload, store and download packages in an efficiently secure, anonymous and authenticated way. On the other hand, in case of an accusation or a dispute, our system is able to trace the user to his clear identity to solve accusations.

Retos en torno al préstamo de libros digitales en bibliotecas

El desarrollo y la expansión del mercado mundial de libros electrónicos y los modelos asociados al préstamo en biblioteca se encuentran todavía en un estado evolutivo y de cierta incertidumbre. Después de una primera etapa en la que importantes editores se negaban a vender licencias de préstamo, en el momento actual los editores están poniendo más títulos de libros electrónicos a disposición de las bibliotecas, aunque con algunas restricciones. La tendencia dominante se está moviendo inexorablemente hacia una mayor disponibilidad y acceso a títulos digitales para las bibliotecas. Superada esta fase, en torno a la poca disponibilidad de títulos para el préstamo público quedan pendientes otros asuntos como la cuestión de los costes de las licencias, con tarifas diferenciadas de las ofrecidas al público, que se incrementan en algunos casos hasta por tres o más veces del precio de venta al público, lo que complica aún más los procesos de adquisiciones para bibliotecas, en un momento en el que los presupuestos son limitados, lo que dificulta la capacidad de las bibliotecas para dotarse de una colección adecuada de productos digitales. Además de otras cuestiones de carácter, tecnológico y comercial que limitan muchos de los usos que tenían las bibliotecas en el contexto analógico, como la posesión en propiedad de la colección, la estabilidad de la misma, la portabilidad entre plataformas, o las dificultades asociadas a los sistemas DRM de gestión de derechos digitales.