can you give more details?

Here is more details about the Mac OS X 10.5 from the article the link of which is provided in the story.

Marking the downloaded application programs
Any downloaded application programs will be marked by the operating system. The first time you run the downloaded application programs, the system will tell you what time this application downloaded, which download software downloaded it to your hard disk.And if the information full, it will inform the user the URL of this application which can be downloaded from.

Sign the application
Let your use the application procedure safely. An addition aldigital signature of the application can help identity applications, and guarantee its integrity. All third-party software developers to sign license agreements manufacturers with Leopard operating system can complete the application's own signature process.

The firewall basing on the application
Built-in firewall has more control and can permit or intercept Internet access in accordance with the specific behavior over the application procedures.

Powerful encryption disk mirroring
To allow the data of users more secure. Disk tools can now be used to allow the creation of 256 AES encrypted disk mirroring.

Sandy Boxing
This function can prevent hackers hijacking applications and use their own code to carry out sabotage work. This feature limits the application procedures for the visit, Internet access or running other applications.

Strengthening compatibility of smart card
Let your smart card work better, now your key chain hanging in the smart card will support Vol function unlock files, and you can configure that your Apple computer lock the screen automatically when the smart card was removed . Leopard support PIV technical standards.

The random system
To the attacker, the most common security methods are not useful. Hackers can access a memory address system functions and execute malicious code. Such attacks has no role in Leopard system. Because the operating system used thousands of random arrangement of the reconstruction system.

Using the f Windows-based servers also can enjoy the security and compatibility.