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Inferior vena cava (IVC) filters are used as an alternative to anticoagulants for prevention of fatal pulmonary embolism (PE) in venous thromboembolic disorders. Retrievable IVC filters have become an increasingly attractive option due to the long-term risks of permanent filter placement. These devices are shown to be technically feasible in insertion and retrieval percutaneously while providing protection from PE. Nevertheless, there are complications and failed retrievals with these retrievable filters. The aim of the paper is to review the retrievable filters and their efficacy, safety, and retrievability.

Digital rights management systems are required to provide security and accountability without violating the privacy of the entities involved. However, achieving privacy along with accountability in the same framework is hard as these attributes are mutually contradictory. Thus, most of the current digital rights management systems rely on trusted third parties to provide privacy to the entities involved. However, a trusted third party can become malicious and break the privacy protection of the entities in the system. Hence, in this paper, we propose a novel privacy preserving content distribution mechanism for digital rights management without relying on the trusted third party assumption. We use simple primitives such as blind decryption and one way hash chain to avoid the trusted third party assumption. We prove that our scheme is not prone to the "oracle problem" of the blind decryption mechanism. The proposed mechanism supports access control without degrading user's privacy as well as allows revocation of even malicious users without violating their privacy.Index Terms-Accountability, blind decryption, digital rights management (DRM), hash chain, privacy.

Abstract. Authorized domains are used to share digital content among multiple devices without violating the copyright issues. However, if a domain is composed of multiple devices supporting different DRM technology, sharing and accessing of contents among the multiple devices in a domain may not be possible. To address this issue, in this paper we propose a new secure domain architecture which uses a Local Domain Manager (LDM) and T-licenses for achieving interoperability. The LDM serves as a middle entity that handles the distribution of interoperable domain content to all the registered domains according to the T-Licenses provided by the respective content providers. Thus, the proposed domain architecture enables secure sharing and accessing of digital content in an authorized domain.

No abstract