An internal source code audit was conducted to ensure that only clean room reverse engineering was used, and all developers were made to sign an agreement committing them to comply with the project's policies on reverse engineering. ReactOS clarified its Intellectual Property Policy Statement requirements on clean room reverse engineering to avoid potential infringement of United States law. To avoid potential litigation, companies sometimes enact a policy where reimplementation based on disassembled code must be written by someone other than the person having disassembled and examined the original code. In a statement on its website, ReactOS cited differing legal definitions of what constitutes clean-room reverse engineering as a cause for the conflict. Contributions from several active ReactOS developers have been accepted post-audit, and low level cooperation for bug fixes has been still occurring. Since ReactOS is a free and open-source software development project, the claim triggered a negative reaction from the free software community in particular, Wine barred several inactive developers from providing contributions and formal high level cooperation between the two projects remained difficult as of 2006. When approached by NewsForge, Microsoft declined to comment on the incident. On 27 January 2006, the developers responsible for maintaining the ReactOS code repository disabled access after a meeting was held to discuss the allegations. Alex Ionescu, the author of the code, asserted that while the Windows XP binary in question was indeed disassembled and studied, the code was not merely copy-pasted, but reimplemented the reason why the functions were identical, Ionescu claimed, was because there was only one possible way to implement the function. Comparing this function to disassembled binaries from Windows XP, Birr argued that the BadStack function was simply copy-pasted from Windows XP, given that they were identical. The code that Birr disputed involved the function BadStack in syscall.S, as well as other unspecified items. A claim was made on 17 January 2006 by developer Hartmut Birr on the ReactOS developers mailing list (ros-dev) that ReactOS contained code derived from disassembling Microsoft Windows. In order to avoid copyright prosecution, ReactOS had to be expressly completely distinct and non- derivative from Windows, a goal that needed very careful work. In 2002, the ReactOS Foundation was established in Moscow with Maxim Osowski and Aleksey Bragin as executive officers and Vladimir Bragin, Saveliy Tretiakov and Alexey Ivanov on the board of directors. While the term "OS" stood for operating system, the term "react" referred to the group's dissatisfaction with – and reaction to – Microsoft's monopolistic position. The name ReactOS was coined during an IRC chat. The project began development in February 1998 by creating the basis for a new NT kernel and basic drivers. In creating the new project, a new name, ReactOS, was chosen. The revived project sought to duplicate the functionality of Windows NT. As a result, the project members, led by then coordinator Jason Filby, joined together to revive the project. While FreeWin95 had started out with high expectations, there still had not been any builds released to the public by the end of 1997. The project stalled in discussions of the design of the system. History Early development Īround 1996, a group of free and open-source software developers started a project called FreeWin95 to implement a clone of Windows 95. ReactOS, as part of the FOSS ecosystem, re-uses and collaborates with many other FOSS projects, most notably the Wine project, which presents a Windows compatibility layer for Unix-like operating systems. The project partially implements Windows API functionality and has been ported to the AMD64 processor architecture. ReactOS is primarily written in C, with some elements, such as ReactOS File Explorer, written in C++. However, many Windows applications are working, such as Adobe Reader 9.3, GIMP 2.6, and LibreOffice 5.4. As of February 2022, it is still considered feature-incomplete alpha software, and is therefore recommended by the developers only for evaluation and testing purposes. ReactOS has been in development since 1996. ReactOS has been noted as a potential open-source drop-in replacement for Windows and for its information on undocumented Windows APIs. ReactOS is a free and open-source operating system for amd64/ i686 personal computers intended to be binary-compatible with computer programs and device drivers developed for Windows Server 2003 and later versions of Microsoft Windows. ReactOS 0.4.14 running the Firefox Web browser Hybrid (designed to be compatible with Windows NT family) CD-ROM ISO image, QEMU image, VirtualBox image, VMware image, or source code
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