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Wiener Staatsoper is one of the most famous opera houses in the world, known as the "opera center of the world", with a total area of 9000 square meters, located in the old town of Vienna on the Ring road, the former Royal Court theatre.

Since its establishment, the Vienna State Opera has been employing those highly respected and skilled musical masters as the theater manager, and the Vienna Philharmonic Orchestra as the permanent opera band, and at the expense of employing world famous singers as opera protagonists. The theatre's rule was not to stage unknown works or debuts, but only those that had already been established. These regulations and measures have earned it international prestige.

The adoption of Cadac by Vienna State Opera is a recognition of the Cadac brand and service.