According to Baidu Encyclopedia, the developer is Eugene Rochelle (Russian: евгенийлазавичрр).
Eugene Rochelle1March 972 1972 was born in Russia. He graduated from Chelyabinsk Technical University in Russia (now Southern Wula State University) and is also the author of FAR File Manager. He developed programs to compress or decompress RAR files, which were originally used in DOS and later transplanted to other platforms. The main Windows version encoder, named WinRAR, is released in the form of * * * software. However, Rochelle disclosed the source code of the decoder. The license of UnRAR decoder allows conditional free publishing and modification, provided that it is not allowed to publish and compile RAR-compatible encoders, which have always been patented. The latest developer is Eugene Rochelle's brother Alexander Rochelle. Although its decoder is patented, the compiled decompressor still exists on several platforms, such as open source 7-Zip.