
The way this works is a virtual barrier called a "sandbox" is set up around a running program that isolates it from the rest of the system. Sandboxing is a security technique that acts as a last line of defense against exploited, buggy, or otherwise compromised applications, which Apple is implementing to ensure programs distributed through the Mac App Store are as safe and secure as possible. Since Apple initially scheduled to implement this requirement in November of this year, this announcement is nothing new and is more of a timeframe shift than anything else however, it still raises questions and concern over what this means for developers and end users.

Recently Apple announced to developers that beginning in March 2012, all applications submitted to the Mac App Store will require support for Apple's sandboxing routines.
