 Though still copyrighted, annotated source code for key components of Atari 8-bit family system software was published in mass market books, including "The Atari BASIC Source Book" (full source for Atari BASIC) and "Inside Atari DOS" (full source for Atari DOS).The SHARE users group, founded in 1955, began collecting and distributing free software.The first documented distribution from SHARE was dated 17 October 1955.