Meanwhile, the first IBM PCs were leaked in the USSR, and with them the "bourgeois" borrowed VENIX - a clone of UNIX. Unfortunately, the source texts of the core were absent, and Dmitry Burkov decided to take an unprecedented step: he disassembled the core and recreated the source code in the C language, which after compilation gave the identical machine code - a sort of programming feat! (c) What licenses can be purchased? )