DirectX 9.0 is a System Utilities software developed by Microsoft Corporation. After our trial and test, the software is proved to be official, secure and free. Here is the official description for DirectX 9.0:

BS Editor: Microsoft DirectX 9.0c delivers fast performance for DirectX-enabled games and other rich media software.
This download provides the DirectX 9.0c end-user multi-languaged redistributable that developers can include with their product. The redistributable license agreement covers the terms under which developers may use the Redistributable. For full Details please Review the DirectX SDK EULA.txt and DirectX Redist.txt files located in the license directory