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RAR (file format)
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RAR (file format) : ウィキペディア英語版
RAR (file format)

RAR is a proprietary〔The RAR Archiver EULA (End user license agreement), embedded in installation files, states: ''Neither RAR binary code, WinRAR binary code, UnRAR source or UnRAR binary code may be used or reverse engineered to re-create the RAR compression algorithm, which is proprietary, without written permission of the author.''〕 archive file format that supports data compression, error recovery and file spanning. It was developed by a Russian software engineer, Eugene Roshal (the name RAR stands for Roshal ARchive) and the RAR software is licensed by ''win.rar GmbH''.〔(Contact to win.rar GmbH )〕
== File format ==
The filename extensions used by RAR are .rar for the data volume set and .rev for the recovery volume set. Previous versions of RAR split large archives into several smaller files, creating a "multi-volume archive". Numbers were used in the file extensions of the smaller files to keep them in the proper sequence. The first file used the extension .rar, then .r00 for the second, and then .r01, .r02, etc.
RAR compression applications and libraries (including GUI based WinRAR application for Windows, console rar utility for different OSes and others) are proprietary software, to which Alexander L. Roshal,〔The RAR Archiver EULA (End user license agreement) - embedded in installation files - ()() - states: ''Neither RAR binary code, WinRAR binary code, UnRAR source or UnRAR binary code may be used or reverse engineered to re-create the RAR compression algorithm, which is proprietary, without written permission of the author.''〕 the elder brother of Eugene Roshal, owns the copyright. Version 3 of RAR is based on Lempel-Ziv (LZSS) and prediction by partial matching (PPM) compression, specifically the PPMd implementation of PPMII by Dmitry Shkarin.〔(【引用サイトリンク】title=unrarlib FAQ )
The minimum size of a RAR file is 20 bytes. The maximum size of a RAR file is 9,223,372,036,854,775,807 (263-1) bytes, which is 8 exbibytes minus 1 byte.〔(【引用サイトリンク】accessdate=2013-05-01 )

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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