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The Internet has made possible the access to thousands of freely available music tracks with Creative Commons or Public Domain licenses. Actually, this number keeps growing every year. In practical terms, it is very difficult to browse this music collection, because it is wide and disperse in hundreds of websites. To address the music recommendation issue, a case study on existing systems was made, to put the problem in context in order to identify necessary building blocks. This thesis is mainly focused on the problem of indexing this large collection of music. The reason to focus on this problem, is that there is no database or index holding information about this music material, thus making this research on the subject extremely difficult. In order to figure out what software could help solve this problem, the state of the art in “O...
As plataformas de redes sociais têm ganho muita popularidade junto dos utilizadores de Internet. Actualmente milhões e milhões de pessoas em todo o mundo interagem com diferentes tipos de redes sociais online para que possam partilhar as suas experiências e conteúdos com os seus amigos virtuais com que interagem. Documentos, vídeos, músicas e fotografias são partilhados na Web, confiando muitas das vezes nos controlos de privacidade e segurança oferecidos pelas plataformas de redes sociais, disponibilizando algumas delas algum controlo sobre o conteúdo. Estes aspectos originam problemas sérios no que diz respeito à privacidade dos utilizadores. O controlo sobre o conteúdo partilhado online através das redes sociais está completamente fora do poder de decisão dos utilizadores estando este do lado de quem gere as plataform...
A Internet tornou possível o acesso a milhares de faixas musicais disponíveis gratuitamente segundo uma licença Creative Commons ou de Domínio Público. Na realidade, este número continua a aumentar em cada ano. Em termos práticos, é muito difícil navegar nesta colecção de música, pois a mesma é vasta e encontra-se dispersa em milhares de sites na Web. Para abordar o assunto da recomendação de música, um caso de estudo sobre sistemas de recomendação de música existentes foi elaborado, para contextualizar o problema e identificar os grandes blocos que os constituem. Esta tese foca-se na problemática da indexação de uma grande colecção de música, pela razão de que, não existe uma base de dados ou índice que contenha informação sobre este repositório musical, tornando muito difícil o estudo nesta matéria. De forma a compreender ...
Online social networks gained a huge popularity among Internet users. Currently millions and millions of online actors use some kind of social online networks (or multiple) to share their experiences and content with their virtual online friends. Documents, videos, music and pictures are shared on-line, relying on the privacy and security controls offered by the social network platform, offering little control for the end user. This aspect origins serious privacy concerns, since the control over the content shared on-line on the social network, is out of their hands, and control is passed to the social network. This document proposes a different paradigm for content privacy shared on social networks that is centered on the user and not on the social network platform. In order to achieve this objective, an arc...
This dissertation aims to develop an integrated system for the management of scientific events by integrating several open source applications. In order with proceed to this integration, these solutions were considered as part of the developing system. The choice of the integrating applications, was made based on diverse/multiple defined criteria, and a study have been conducted to choose the base application for the scientific conference type events management. The choice of the remaining applications/components, was made based on defined criteria, namely, the code simplicity, the project's activity, as well as the importance of the application regarding the covered functionalities, among others. This dissertation is framed in a concept followed nowadays in the world of Information Systems, the EAI (Enterprise Application Int...
A Nova Economia, baseada essencialmente na Internet, depende em muito da validade e segurança da informação. O comércio em geral não poderia existir se laços de confiança entre vendedor e comprador não fossem estabelecidos. No Comércio Electrónico este aspecto é de especial importância devido à inexistência do tradicional contacto físico entre ambos. Os novos modelos de comercialização de conteúdos digitais através de meios electrónicos levantam igualmente desafios de segurança e de gestão e protecção da propriedade intelectual que devem ser encarados de uma forma séria utilizando um conjunto de medidas de segurança eficientes. A confiança é igualmente importante para este tipo de Comércio Electrónico. Apesar do problema de confiança não depender somente de uma componente tecnológica, não há dúvida de que esta representa igualmente u...
DES has been used for a long time to guarantee the privacy of transactions in open communication environments, especially in inter-banking and financial ones. Nevertheless, the security level offered by this algorithm is not the same that was before. The DES working conditions have been shifting with the exponential growth of the Internet, and what was considered as being safe a decade ago is not safe anymore. What this article intends to show is how weak the actual DES strength is, and how and what a determined attacker can do to break it using the new Java programming language and the Linux operating system.
Livro de programação com PHP 4.
Today’s technology is raising important challenges in the Intellectual Property (IP) field in general and to Copyright in particular [Arkenbout et al., 2004]. The same technology that has made possible the access to content in a ubiquitous manner, available to everyone in a simple and fast way, is also the main responsible for the challenges affecting the digital content IP of our days [Chiariglione, 2000]. Technological solutions and legal frameworks were created to meet these new challenges. From the technological point of view, Rights Management Systems (RMS) and Copy Protection Systems (CPS) have been developed and deployed to try to cope with them. At first, they seemed to work however, their closed and non-interoperable nature and a growing number of wrong strategic business decisions, soon lead to a strong opposition. One of the...
Today’s technology is raising important challenges in the Intellectual Property (IP) field in general and to Copyright in particular [Arkenbout et al., 2004]. The same technology that has made possible the access to content in a ubiquitous manner, available to everyone in a simple and fast way, is also the main responsible for the challenges affecting the digital content IP of our days [Chiariglione, 2000]. Technological solutions and legal frameworks were created to meet these new challenges. From the technological point of view, Rights Management Systems (RMS) and Copy Protection Systems (CPS) have been developed and deployed to try to cope with them. At first, they seemed to work however, their closed and non-interoperable nature and a growing number of wrong strategic business decisions, soon lead to a strong opposition. One of th...
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