Abstract
This article presents a literature review and the discussion about the key concepts associated with data markets. Data markets have multiple centralized and decentralized approaches. The main problem is the trust and reliability of supplies, inflows, and suppliers. The proposed study object is the decentralized marketplace data supported by Blockchain technology to ensure confidence in the supply chain of data, in the actors involved in the market and the data sources. The application scenarios are proposed in a model with four levels, data provision, data delivery, rights management, and producer internal sources. That will be done with Blockchain technology, through contracting using smart contracts, the controlled delivery of data by the data producers, the management of flows of data, and access control to data. © 2019, Springer Nature Switzerland AG.

Abstract
Today’s society presents a fast development marked by the digital era, where the sharing, disclosure and access to information is made through information and communication technologies. The use of mobile applications is growing exponentially, spreading to the most varied social classes and everyday activity areas. Worldwide, its use in the most variety of services, has been increasing significantly. Given that, it is essential that mobile applications are accessible in a way that allows access conditions and equal opportunities to all the users. With this study we present indicators regarding the state of accessibility in mobile applications through the evaluation of five Portuguese public administration applications. The methodology used was a fully manual evaluation through a proposal of a model of evaluation divided by quantitative and qualitative requirements created by us, as well as the use of functionalities such as VoiceOver and TalkBack. Taking into account that the study initially proposed on accessibility in mobile applications is the first to be carried out in Portugal and one of the few currently worldwide, it is believed that its content may help, in some way, to raise awareness of the state of accessibility in the Portuguese mobile applications, to create measures that make these applications more accessible to all and that this work could be taken into account in future studies of the topic. © 2019, Springer Nature Switzerland AG.

Abstract
In rural destinations like Douro region, tourism activities may be important to territories’ development because they use some of their natural resources and endogenous products, develop another related local economy business, and contributes to population fixation. Technologies can support the promotion and distribution of these destinations, namely digital marketing tools. The present study aims to analyze the influence that some of these tools perceived usefulness, from the tourist point of view, have on a rural destination image. To accomplish this, it was used a sample of 555 tourists visiting Douro destination and data collected were analyzed using structural equation modeling. The results demonstrated that tourist’s trust in tourism digital marketing tools and their attitude toward these tools have an indirect effect on destination image. Moreover, the perceived usefulness of some digital marketing tools utilized to search, plan or purchase Douro destination, as website, booking and mobile devices, has also a positive effect on this destination image. On another hand, the perceived usefulness of a conventional channel, as travel agencies, has a negative effect on this rural destination image. This research provided some interesting insights for practitioners working in tourism destination marketing. © 2020, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG.

Abstract
The Internet of Things (IoT) is rapidly becoming ubiquitous and applied in different domains such as human health, building automation, industrial control and environmental monitoring, introducing new security and privacy challenges. Thus, the security of data, devices and communications of IoT networks are a concern due to the sensitivity of the data used, legal and privacy issues, and the diversity of devices and protocols used. In addition, traditional security mechanisms cannot always be feasible and adequate because of the number, heterogeneity, and resource limitations of IoT devices. In this work, we are concerned with the design of an Intrusion Detection System (IDS) to protect IoT networks from external and internal threats in real time. To do this, after studying the various traditional IDS solutions, as well as new IDS proposals designed specifically for IoT networks, we conclude that there are still several improvements to be made to this type of 2nd line defense mechanism. The design proposed will consider the specific architecture of an IoT network, the scalability and heterogeneity of this type of environment, the minimization of the use of resources, and the maximization of the efficiency in the detection of intrusions. To do so, we consider the various detection methods available and the various types of attacks to which this type of network is exposed. The proposed IDS is network-based and relies on a hybrid architecture (centralized / distributed). As methods of detection, the signature / anomaly-based methods will be used simultaneously. Finally, it is emphasized that this proposal does not require the modification of the IoT software, nor does it influence the performance of the applications in the IoT devices.

Abstract
Of all the technologies born in the 20th century the software industry is the sole one that has kept a large dependency on human physical effort in order to produce the necessary code for an Information Technology system to perform. This paper analyses that evolution in view of today's state-of-the-art regarding automatic code generation based on model definitions for critical business purposes. The social, financial and technological benefits will be addressed as they are disruptive and will affect different levels of society as we know it. Several testimonies were also sought regarding the technology described herein and how it may affect us in our day-to-day lives. We conclude that the software industry is in the midst of a major revolution - which has arrived late in comparison to other industries related to technology and which have decreased the reliance on human labour some time ago.

Abstract
Virtual reality technologies have grown in complexity and functionality, increasing their relevance in various sectors of activity. Applying these innovations to tourism is advantageous for the organisations, the tourists and even the territories. They can provide multisensory immersivity, simulate actions and movements in real-time, enriching reality using interactive virtual objects. Thus, captivating visitors and showing territories from richer and livelier perspectives. This study describes a review of the adoption of virtual reality technology at the organisational level. In order to adapt the literature review to the tourism topic, the process of analysis of the literature was carried out with a constant concern to analyse research that studied the topic. Assuming the need to further develop the work done and to obtain a confirmation on the contribution resulting from the bibliographic review, a focus group was developed, which allowed several specialists to discuss collaboratively and interactively the research project topics without having to be in face-to-face contact. The results of this study allow not only to acknowledge the relevance of virtual reality for tourism but also to understand how the existing literature and experts are aligned with the identification of opportunities for disruptive development of solutions that trigger tourism destinations and organisational development.