What is Readium?
The Readium Foundation was created in March 2013 as an independent non-profit corporation. The Open Source Foundation aims to develop technology for expediting the adoption of ePUB3 and the Open Web Platform by the Digital Publishing Industry. It strives to deliver leading-edge functionality that is fully specified, free, open, and interoperable.
Readium aims at networking and coordinating between other similar open-source efforts. Among them, the European Digital Reading Lab (EDRLab) is the most important participant of the Readium project. In addition, EDRLab is also the driving force behind the LCP (Licensed Content Protection) system, which is a significant new development of Readium.
The Readium project aims to develop a robust, high-performance, cross-platform, and standards-compliant ePUB reading system, which can be used by the native applications of both mobiles, tablets as well as desktop systems. This engine can be deployed in browsers and embedded into browser apps such as Google Chrome extension or into native applications.
The Readium SDK is an ePUB reader SDK (software development kit) very much similar to that of Adobe’s Reader Mobile SDK (RMSDK) in terms of its capability and scope. The Readium SDK performs simplistic test applications for the different operating systems, whether it be Android, iOS, or even OS X, apart from supporting encryption-based modules. Although it can work along with various web browsers, the Readium SDK prioritizes the development of the WebKit over everything else.
Goals of the Readium Project
The Readium project’s primary goals were to:
- Facilitate the rapid implementation of ePUB3, without depending on or proliferating proprietary technologies.
- Provide functional and innovative ePUB reading systems for web use. At present, two systems are available: ReadiumCloudReader and Readium Chrome Extension. ReadiumCloudReader is a cross-browser solution for embedding in the websites of users, whereas Readium Chrome Extension is available for download in the Google Chrome Store.
- Create a cross-platform native code software development kit (SDK), which you can use to build native applications across different hardware platforms.
- Create a platform, which is able to support a variety of digital publishing formats such as ePUB 2.x and 3.x, audiobooks, Web Pub, and image-based books such as Manga.
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Features of Readium
The wide popularity of Readium is mainly due to some of the integral qualities of this ePUB reader. Following are some of the general features of Readium:
- Accessibility – Readium is available for both open source as well as proprietary applications.
- Portability– Readium can be ported or deployed to a wide variety of platforms, including desktop and mobile devices, browsers, and native applications. Its target platforms are iOS, Android, Browser-based, and Desktop.
- Communication– Readium actively tries to create a courteous, welcoming and approachable environment for newcomers in the field. Readium makes use of public chat rooms and a public mailing list to communicate and discuss with its contributors. Through these channels, Readium gives equal value to the ideas of both new as well as existing contributors.
- Standards Compliance – Readium makes use of regression testing to ensure strict compliance and compatibility with the latest ePUB3 specifications. Moreover, it also provides feedback to the IDPF ePUB standards community and the broader W3C and web standards community by introducing the latest technologies and ensuring that the new standards can be implemented in their engine. Readium is not only compliant with all the applicable W3C specifications and with ePUB, but also with most of the other emerging digital publishing formats such as audio and comic books.
- Compatibility – Along with ensuring its compatibility with the ePUB specifications, Readium also makes sure to comply with the latest emerging standards such as that of WebPub. Readium ensures that their compatibility with the ePUB reading systems does not come at the cost of standards compliance.
- Stability – Readium maintains the highest degree of stability possible through a careful release process that closely monitors the issues reported by internal testing and external forums. It prioritizes instant fixes and releases for crashes, hangs, and regressions.
- Performance – Readium constantly strives to improve its speed and memory efficiency.
- Security – Readium strives to protect its users from security violations and threats by instant fixes of security issues.
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Architecture of Readium
The relationship between the parts of the architecture of Readium is illustrated in the diagram below:
This is the platform-independent Core C++ code that manages the ePUB package, metadata, and various functions such as the navigation and fetching of resources.
In addition to managing the messaging between the native layers, the layer also provides better management of views.
These platform-specific applications facilitate the testing of the rest of the SDK and provide a rudimentary demonstration of how to integrate the native applications within the SDK. They are made deliberately limited and crude, as Readium does not want to compete with its own members.
The Next Step
When Google announced its decision to disable the use of Readium, the need for an alternate solution to substitute Readium had arisen. Kitaboo is an e-publishing platform that can serve as a viable alternative to Readium. It is designed for publishers to create and deliver eBooks. Kitaboo eBook platform and Kitaboo SDK find favor with many leading publishers. The Kitaboo SDK framework can be integrated on any platform – Android, iOS, Windows and HTML. It lets you customize and integrate all its functionalities into your system of choice, helping you create a robust ePUB reading system for mobile and desktop devices.
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