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WinRAR is a trialware file archiver utility, developed by Eugene Roshal of win.rar GmbH. It can create and view archives in RAR or ZIP file formats, [ 6 ] and unpack numerous archive file formats. To enable the user to test the integrity of archives, WinRAR embeds CRC32 or BLAKE2 checksums for each file in each archive.
RAR files can only be created with proprietary WinRAR (Windows), RAR [9] for Android, command-line RAR (available for Windows, macOS, Linux, and FreeBSD), and other software that has written permission from Alexander Roshal or uses copyrighted code under license from Roshal. The software license agreements forbid reverse engineering. [4]
Most of the 7-Zip source code is under the LGPL-2.1-or-later license; the unRAR code, however, is under the LGPL-2.1-or-later license with an "unRAR restriction", which states that developers are not permitted to use the code to reverse-engineer the RAR compression algorithm.
[citation needed] WinRAR is a notable example of an unlimited trialware, i.e. a program that retains its full functionality even after the trial period has ended. The rationale behind trialware is to give potential users the opportunity to try out the program to judge its usefulness before purchasing a license.
WinZip 1.0 was released in April 1991 as a graphical user interface (GUI) front-end for PKZIP. [5]Former WinZip icon. From version 6.0 until version 9.0, registered users could download the newest versions of the software, enter their original registration information or install over the top of their existing registered version, and thereby obtain a free upgrade.
Eugene Roshal (Russian: Евгений Лазаревич Рошал, romanized: Yevgeniy Lazarevich Roshal; born 1972) is a Russian software engineer best known for developing the RAR file format, the WinRAR archiver, and the FAR file manager.