We incorporates the code by Info-ZIP group, which is used to handle ZIP archives.

RAR4 and ZIP PPMD decompression includes parts of code based on Dmitry Shkarin PPMd and Dmitry Subbotin carryless rangecoder public domain source code.

We encryption includes parts of code from Szymon Stefanek and Brian Gladman AES implementations also as Steve Reid SHA-1 source.

We uses CRC32 function based on Intel Slicing-by-8 algorithm.

We archives may optionally include BLAKE2sp hash, designed by Jean-Philippe Aumasson, Samuel Neves, Zooko Wilcox-O'Hearn and Christian Winnerlein.

Public domain LZMA SDK by Igor Pavlov, developer of 7-Zip archiver, is used to decompress 7z, XZ and LZMA ZIP archives.

We used "Screaming Fast Galois Field Arithmetic Using Intel SIMD Instructions" paper by James S. Plank, Kevin M. Greenan and Ethan L. Miller to improve Reed-Solomon coding performance. Also we are grateful to Artem Drobanov and Bulat Ziganshin for samples and ideas allowed to make Reed-Solomon coding more efficient.