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The Global ETD Search service is a free service for researchers
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Showing 441 to 443 of 443 (0.028 seconds)Spelling suggestions: "subject:"acheck"" "subject:"1check""
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Support consumers' rights in DRM : a secure and fair solution to digital license reselling over the InternetGaber, Tarek January 2012 (has links)
Consumers of digital contents are empowered with numerous technologies allowing them to produce perfect copies of these contents and distribute them around the world with little or no cost. To prevent illegal copying and distribution, a technology called Digital Rights Management (DRM) is developed. With this technology, consumers are allowed to access digital contents only if they have purchased the corresponding licenses from license issuers. The problem, however, is that those consumers are not allowed to resell their own licenses- a restriction that goes against the first-sale doctrine. Enabling a consumer to buy a digital license directly from another consumer and allowing the two consumers to fairly exchange the license for a payment are still an open issue in DRM research area. This thesis investigates existing security solutions for achieving digital license reselling and analyses their strengths and weaknesses. The thesis then proposes a novel Reselling Deal Signing (RDS) protocol to achieve fairness in a license reselling. The idea of the protocol is to integrate the features of the concurrent signature scheme with functionalities of a License Issuer (LI). The security properties of this protocol is informally analysed and then formally verified using ATL logic and the model checker MOCHA. To assess its performance, a prototype of the RDS protocol has been developed and a comparison with related protocols has been conducted. The thesis also introduces two novel digital tokens a Reselling Permission (RP) token and a Multiple Reselling Permission (MRP) token. The RP and MRP tokens are used to show whether a given license is single and multiple resalable, respectively. Moreover, the thesis proposes two novel methods supporting fair and secure digital license reselling. The first method is the Reselling Deal (RD) method which allows a license to be resold once. This method makes use of the existing distribution infrastructure, RP, License Revocation List (LRL), and three protocols: RDS protocol RD Activation (RDA) protocol, and RD Completion (RDC) protocol. The second method is a Multiple License Reselling (MLR) method enabling one license to be resold N times by N consumers. The thesis presents two variants of the MLR method: RRP-MR (Repeated RP-based Multi-Reselling) and HC-MR (Hash Chain-based Multi-Reselling). The RRP-MR method is designed such that a buyer can choose to either continue or stop a multi-reselling of a license. Like the RD method, the RRP-MR method makes use of RP, LI, LRL, and the RDS, RDA, and RDC protocols to achieve fair and secure reselling. The HC-MR method allows multiple resellings while keeping the overhead on LI at a minimum level and enable a buyer to check how many times a license can be further resold. To do so, the HC-MR utilises MRP and the hash chain cryptographic primitive along with LRL, LI and the RDS, RDA and RDC protocols. The analysis and the evaluation of these three methods have been conducted. While supporting the license reselling, the two methods are designed to prevent a reseller from (1) continuing using a resold license, (2) reselling a non-resalable license, and (3) reselling one license a unauthorised number of times. In addition, they enable content owners of resold contents to trace a buyer who has violated any of the usage rights of a license bought from a reseller. Moreover, the methods enable a buyer to verify whether a license he is about to buy is legitimate for re-sale. Furthermore, the two methods support market power where a reseller can maximise his profit and a buyer can minimise his cost in a reselling process. In comparison with related works, our solution does not make use of any trusted hardware device, thus it is more cost-effective, while satisfying the interests of both resellers and buyers, and protecting the content owner's rights.
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Návrh metod hodnocení ukazatelů efektivity civilních letišť / Evaluation design of civil airports effectivity indicesNovotný, Roman January 2011 (has links)
Introductory part of this thesis concludes the development of air traffic, division of airports in the Czech Republic according to the Ministry of Transport, according to the Law on Civil Aviation and according to the Coding of the airports (Requirement L 14). The aim was to realize theoretical definition and division of output and economic indicators. After that comes choice of appropriate airports from the European Union. The choice has been made on the basis of the number of check-in passengers at the airport in Prague-Ruzyně. Eight most suitable airports have been chosen from all twenty-seven member countries of the EU. The following step is comparative analysis of these chosen airports on the basis of specified output and economic indicators for the years 2005-2009. The year 2010 has not been included, because the chosen airports did not complete their annual reports, balances and statements of profit and loss. From these sources the values for calculation of individual indicators have been chosen. These indicators have been shown in charts, evaluated by means of graphs in Excel Programme and further they have been characterized in words. The aim of the thesis was also the evaluation and comparison of output and economic indicators of effectiveness and after evaluation, proposal of methods of evaluations has followed.
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”Maten är kass, men lärarna är snälla” : Recensioner av gymnasieskolor - ett beslutsunderlag för gymnasievalet på skolmarknaden / ”The food is crappy, but the teachers are kind” : Reviews of schools – basis for decision-making for upper secondary school election on a school marketBarakat, Mohammed, Östergren, Rolf January 2019 (has links)
Syfte och frågeställningar Syftet med uppsatsen är att få en förståelse för vad det är elever som söker till gymnasieskolan kan tänkas möta då de läser recensionstexter. Syftet är således att kartlägga recensionssystemets omfattning och innehåll kvantitativt; vad som tas upp i recensionstexterna, samt att undersöka hur recensionstexterna är konstruerade. Avslutningsvis syftar uppsatsen till att diskutera recensionssystemet i en större samhällskontext - som ett resultat av och en del i vår samtid. Vilka ämnen och teman förekommer i recensionstexter av gymnasieskolor samt hur frekvent är förekomsten? Hur värderas (positivt, negativt eller neutralt) de olika temana i recensionerna? På vilket sätt är recensionstexterna konstruerade och hur kan det tolkas? På vilket sätt framträder en skolmarknadsdiskurs i recensionstexterna? Metod De kvantitativa frågorna undersöks genom en innehållsanalys av slumpmässigt utvalda recensioner på gymnasieskolor i Stockholms län. De förekomna orden kvantifieras och delas in i teman, kategorieroch subkategorier. En bedömning görs även utifrån om de förekomna orden lyfts i en positiv, negativ eller neutral kontext. Den kvalitativa delen utgörs av en textanalys inspirerad av diskursanalysen. Av ett antal utvalda recensioner, baserat på dess innehållsliga relevans, analyseras dessa semantiskt med diskursanalytiska verktyg. I diskussions- och analysdelen behandlas resultatet utifrån det teoretiska ramverket och tidigare forskning. Resultat Av innehållsanalysen framgår att de vanligast förekommande temana var allmänna värdeomdömen om skolan, att kommentera lärare samt skolans upplägg och utbildningens kvalité. Det är även vanligt att sociala aspekter så som atmosfär och gemenskap lyfts fram i recensionerna. Av den kvalitativa delen framgår det att recensenterna uttrycker sig på ett sätt som speglar skolmarknadsdiskursen. I somliga fall framgår tydligt hur recensenten anammat skolmarknadsdiskursen. Slutsats Resultatet indikerar att recensionssystemet riskerar att generera segregerande effekter. Framförallt utifrån den asymmetriska tillgången av information och att skola och identitet knyts allt närmare varandra. Detta förtydligas och ställs på sin spets i hur recensionerna är konstruerade och kan, i vissa fall, tänkas vara svårare att bearbeta då gemene elev tenderar att se recensenter som objektiva (till skillnad från övrig tillgänglig information). / Aim The aim with this study is to explore what kind of information pupils, searching for upper secondary school, might get from reading reviews of schools. The purpose is thus to quantify the scope and content of the review system quantitatively; what is mentioned in the review texts, and to examine how the review are textually constructed. Finally, the paper aims to discuss the review system in a larger social context - as a result of and a part of our time. What topics occur in reviews of upper secondary schools and how frequent is the occurrence? How are the different themes in the reviews valued (positive, negative or neutral)? In what way are the review texts constructed and how can it be interpreted? In what way does a school market discourse appear in the reviews? Method The quantitative questions are examined through a content analysis on randomly selected reviews of upper secondary schools in Stockholm County. The words in question are quantified and divided into themes, categories and subcategories. An assessment is also made based on whether the existing words are lifted in a positive, negative or neutral context. The qualitative part consists of a text analysis inspired by the discourse analysis. From a number of selected reviews, based on its substantive relevance, these are semantically analyzed with discourse analytics tools. In a merged discussion and analysis section, the result is treated on the basis of the theoretical framework and previous research. Results The content analysis shows that the most common themes were general value reviews of the school, commenting on teachers and the school's structure and the quality of the education. It is also common to mention social aspects such as atmosphere and cohesion. From the qualitative part it appears that the reviewers express themselves in a way that reflects the school market discourse. In some cases, it is clear that the reviewer has adopted the school market discourse. Conclusion The result indicates that the review system risks generating segregating effects. Especially based on the asymmetric availability of information and the fact that school and identity are getting more connected. This is clarified and put on its tip in how the reviews are constructed and, in some cases, may be more difficult to process when the common student tends to see reviewers as objective (in contrast to other available sources of information).
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