This is an original DVD of the Apple Mac OSX Leopard 10.5.1 Operating System. It is compatible with Mac operating systems and comes in a format that is suitable for installation. This software was produced by Apple and is perfect for those who want to upgrade their operating system to a newer version. The DVD is in very good condition and can be used to install the software on your computer. This product is perfect for those who need an operating system upgrade but do not want to pay a lot of money for a new one.