Gestion des droits numériques

Résumé

vignette|alt=|284x284px|Écran d'un téléphone affichant un fichier protégé contre la copie La gestion des droits numériques (GDN) ou la gestion numérique des restrictions, en anglais « digital rights management » (DRM), ou encore les mesures techniques de protection (MTP), ont pour objectif de contrôler l'utilisation qui est faite des œuvres numériques par leur chiffrement. Ces dispositifs peuvent s'appliquer à tous types de supports numériques physiques (disques, DVD, PDF, logiciels…) ou de transmission (télédiffusion, services Internet…) grâce à un système d'accès conditionnel. Ces dispositifs techniques ou logiciels peuvent viser à :

restreindre la lecture du support à une zone géographique prévue (par exemple les zones des DVD) ;
restreindre la lecture du support à du matériel spécifique (par exemple les versions smartphone ou tablette) ;
restreindre la lecture du support à un constructeur ou vendeur (afin de bloquer la concurrence) ;
restreindre ou empêcher la copie priv

Source officielle

https://fr.wikipedia.org/wiki/Gestion_des_droits_num%C3%A9riques

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In this thesis, a simple law of adhesion with "digital" decohesion is proposed for modeling unilateral contact with adhesion, together with a stable experiment based on an original axisymmetric epoxy-stamp on glass-disc specimen for measuring the relevant adhesive properties. Both the digital law and the stable experiment are designed for overcoming the instability of the local decohesion process. The law features a digital (binary) decohesion drop without unloading (rather than a continuous decay with unloading). Otherwise, the law is "derived" from an adhesion energy and a decohesion dissipation function per unit interface area (which are not convex, yet dissipative for the later) as any standard generalized tribological law. The adhesion-decohesion properties of the law are the adhesive peak tension πn and the ultimate decohesion gap γn (producing twice the decohesion interface "energy" per unit area 2ω = πnγn). This adhesion-decohesion law is then mounted in parallel with the classical unilateral contact law. A new original axisymmetric specimen made of an epoxy stamp moulded on a glass (or another material) disc is designed and developed. Stability of the global decohesion process is mainly due to the axisymmetrical disc shape of the debonding interface crack, because the crack front perimeter and interface area increase with the crack radius and its square. Debonding stability is further augmented if the stamp base thickness increases with its radius, because the peak tension at the crack front then decreases as the crack radius increases. An optimally stable radial profile is proposed. Based on this specimen, a globally stable loading-unloading decohesion test is developed for measuring the relevant adhesive properties πn and γn or ω (in fact ω directly and πn and γn indirectly). The experiment is reproducible and the measures are accurate. The good agreement between numerical and experimental results confirms the validity of both the simple digital adhesion-decohesion law and the stable experiment with the new specimen. Finally, the robustness and versatility of the specimen to study adhesion are assessed by exploring many various tracks: adhesion between epoxy and different disc materials, stick-slip crack propagation, debonding stability under force control, stability with irregular initial crack, phenomenon of healing adhesion, possibility to use the optical methods in adhesion experiments and adhesion between different materials.

EPFL2008

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Experiments in digital publishing: creating a digital compendium

Matteo Romanello

This chapter introduces the readers and users to the goals of the digitally provided index of the compendium Structures of Epic Poetry and the methods used for it. It also expands on the broader applicability of digital methods in view of electronic publishing, and to the problems involved. The chapter focuses on two aspects of my work for the compendium, where digital tools played a central role: the creation of the index locorum and the development of a digital compendium to the printed volumes.

De Gruyter2019

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Information Security. Proceedings 10th International Conference, ISC 2007

Arjen Lenstra

The following topics were dealt with: intrusion detection; digital rights management; symmetric-key cryptography; cryptographic protocols; identify-based cryptography; cryptanalysis; network security; software obfuscation; public-key cryptosystems; elliptic curves; database security and privacy.

Springer2007

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