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This video is part of the computer/information/cyber security and ethical hacking lecture series; by Z. Cliffe Schreuders at Leeds Beckett University. Laboratory practical work sheets, slides, and other educational resources are available at http://z.cliffe.schreuders.org. The slides themselves are creative commons licensed CC-BY-SA, and images used are licensed as individually attributed. This was the first lecture I recorded with the webcam, so please forgive the fact that I did not stay directly in front of the camera. Topics covered in this lecture include: Popular Operating Systems Microsoft Windows Apple Macintosh Linux Free and open source software (FOSS) Unix/Linux Security Why you should care about Unix and Linux... A short history lesson Unix security goals Unix security Unix Certification : Single UNIX Specification (SUS) Richard Stallman (aka: rms) Copyleft GNU (GNU is Not Unix) Linus Torvalds GNU/Linux Distributions The Linux kernel GNU/Linux Distributions Some More FOSS Terminology Free software – emphasizes the freedom granted Open source software – emphasizes the development methodology Large corporations hire programmers to contribute to Linux