Digital Right Management systems (DRMs) generally handle media data in a compressed and encrypted form. It is often necessary to watermark these media items in the compressed-encrypted domain itself for tamper detection or ownership declaration or copyright management purposes. It is a challenge to watermark these compressed encrypted streams as the compression process would have packed the information of raw media into a low number of bits and encryption would have randomized the compressed bit stream. Attempting to watermark such a randomized bit stream can cause a dramatic degradation of...

Digital Right Management-Systeme (DRMs) verarbeiten Mediendaten in der Regel in komprimierter und verschlüsselter Form. Häufig ist es erforderlich, diese Medienelemente in der komprimierten verschlüsselten Domäne selbst mit einem Wasserzeichen zu versehen, um Manipulationen zu erkennen oder eine Eigentumserklärung oder Urheberrechtsverwaltung zu ermöglichen. Es ist eine Herausforderung, diese komprimierten, verschlüsselten Ströme mit einem Wasserzeichen zu versehen, da der Komprimierungsprozess die Informationen der Rohmedien in eine geringe Anzahl von Bits gepackt hätte und die...

Ontology represents relationships among set of terms and concepts in hierarchical fashion. Ontology plays crucialrole in formulization of information related to given domain. Understanding these ontologies without havingsufficient knowledge of ontology editors is like working on project without knowing its requirements. Traditionaltext mining methods and aero-text systems for extracting key phrases have been used but it needs to be improved tosupport large scale ontology constitution for real world applications. An sufficient amount of documents present onweb puts the users in state of...