Information:  - StepMania is a cross-platform rhythm video game and engine. It was originally developed as a simulator of Konami's arcade game series "Dance Dance Revolution", and has since evolved into an extensible rhythm game engine capable of supporting a variety of rhythm-based game types. Released under the MIT License, "StepMania" is open source free software.  - Proprietary software is computer software for which the software's publisher or another person retains intellectual property rightsusually copyright of the source code, but sometimes patent rights.  - In the Groove ( abbreviated ITG ) is the first game in the In the Groove franchise , published by RedOctane and developed by Roxor Games , and first released in video arcades around August 30 , 2004 .  - Linux (pronounced or, less frequently) is a Unix-like computer operating system assembled under the model of free and open-source software development and distribution. The defining component of Linux is the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. The Free Software Foundation uses the name GNU/Linux to describe the operating system, which has led to some controversy.  - Founded in 2002, Roxor Games, Inc. is a 25-person company based in Austin, Texas that develops video game software for the arcade and home markets. Roxor works with developers of open source software to deploy games on a Linux-based hardware platform in the arcade and on multiple home consoles. Although their most well known product, "In The Groove", is proprietary software, the developers regularly contribute code back to the open source project StepMania upon which "In The Groove" is based.    After reading the paragraphs above, we are interested in knowing the entity with which 'in the groove ' exhibits the relationship of 'license'. Find the answer from the choices below.  Choices: - copyright  - free software  - konami  - open source  - proprietary software
Answer:
proprietary software