1. INSTALLATION AND USE RIGHTS.
a. Installation and Use. You may install and use any number of copies of the software on your devices.
….
4. BACKUP COPY. You may make one backup copy of the software. You may use it only to reinstall the software.
— from Microsoft DirectX SDK (March 2009) EULA
Maybe it is because I don’t deal in legalize daily, but I am still laughing 😀