https://docs.google.com/document/d/1HQvt_EQSf0n7I79rGzjFJYVwGs7pePpdrp920OQFU80/edit?hl=pt_BR
http://guidalinux.altervista.org/suselinux-manual_pt_BR-10.1-10/sec.acls.handle.html#tab.mask
http://guidalinux.altervista.org/suselinux-manual_pt_BR-10.1-10/sec.acls.handle.html
http://www.stato.blog.br/wordpress/?p=304
http://www.lynchjim.com/doc/kde/HTML/pt_BR/kubuntu/sharing/samba-fileprint-security.html