Locked files in OS X!

OS X lets you lock file and it can be very useful if you want to make sure you don't accidently delete them. To lock a file, go to Get Info, or Command-I and check the checkbox next to "Locked". OS X will warn you if you try to put a locked file in the trash and once it is in the trash, you'll have to hold down Option while choosing Empty Trash to actually delete the file.

Posted from my iPhone.