My apologies if this is a question with an easy answer but I'm a mac convert as of 1 week ago so have little experience with the operating system thus far. However, since getting my mac, I've noticed that when I download programs from the internet (such as Firefox), they appear in my applications folder with a white circle and slash through them. This has not happened with program that I've installed using Mac Disks (such as Microsoft Office) Here is a picture of the circle/slash I found on the internet: http://img.skitch.com/20100117-qjq3qg6xewuayii8rit6hqgarj.png Interestingly enough, however, if, after saving the program in my applications folder, I move the program to my desktop, then move it back to my applications folder, the circle/slash disappears and never comes back. At no point did the program behave funny or not work. Any idea what this is? Am I doing something wrong or is the circle/slash just some indicator that the program I downloaded is not from a trusted source.