How to Lock Folders/Directories in Linux

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http://linuxers.org – Whenever I go to home on vacations, I usually share a lot of Music/Videos with my friends. On many occasions, my laptop is being used by someone else and since its a personal notebook, there is a lot of stuff I don't want people to mess around with. Under such cases, restricting other users by locking stuff comes in handy. Since, most of my hometown friends are neither really techie nor even Linux users, a simple change in file permissions does the trick. Lets say, I want to restrict some personal stuff in a folder named "special". Since, the system is being a (General)