Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Berkeley Software Distribution emerged as an independent Unix-like operating system, with the purging of code copyrighted by AT&T, in the period 1989-1994. During this time various open-source BSD derivatives took shape, starting with 386BSD, which was soon succeeded by FreeBSD and NetBSD. OpenBSD emerged in 1995 as a fork of NetBSD. During BSD''s period of legal turmoil, the nearly-complete GNU operating system was made operational by the inclusion of the Linux kernel, and countless operating systems, lumped together under the label "Linux", emerged that were based on this combination.The founder of the The GNU Project and the Free Software Foundation, Richard Stallman, believes that "GNU/Linux" is a more accurate naming convention, as it is reflects that only the kernel is "Linux".