Information: - Frank Biela (born 2 August 1964 in Neuss) is an auto racing driver, mainly competing in touring cars and sportscar racing. He has raced exclusively in cars manufactured by the Audi marque since 1990. - The 24 Hours of Daytona, currently known as the Rolex 24 At Daytona for sponsorship reasons, is a 24-hour sports car endurance race held annually at Daytona International Speedway in Daytona Beach, Florida. It is run on a combined road course, utilizing portions of the NASCAR tri-oval and an infield road course. Since its inception, it has been held the last weekend of January or first weekend of February, part of Speedweeks, and it is the first major automobile race of the year in the United States. It is also the first race of the season for the WeatherTech SportsCar Championship. - Didier Theys (born 19 October 1956) is a Belgian sports car driver. He is a two-time overall winner of the 24 Hours of Daytona (1998 and 2002); a winner of the 12 Hours of Sebring (1998); the Sports Racing Prototype driver champion of the Grand-American Road Racing Association (2002) and the winner of the 24 Hours of Spa (1987 in a factory BMW). He was also the polesitter (1996) and a podium finisher at the 24 Hours of Le Mans (1997, 1998 and 1999). The podium finish in 1999 was a third overall in the factory Audi R8R with co-drivers Emanuele Pirro and Frank Biela. Theys first appearance at Le Mans was in 1982, while his last start in the worlds most famous endurance sports car race came 20 years later in 2002. - The 24 Hours of Le Mans is the world's oldest active sports car race in endurance racing, held annually since near the town of Le Mans, France. It is one of the most prestigious automobile races in the world and is often called the "Grand Prix of Endurance and Efficiency". The event represents one leg of the Triple Crown of Motorsport; other events being the Indianapolis 500, and the Monaco Grand Prix. - Emanuele Pirro (born 12 January 1962, in Rome, Italy) is an Italian former Formula One driver and five time Le Mans 24-hour winner. - The 1987 American Racing Series Championship consisted of 10 races . Didier Theys won three races on his way to the championship . - The 12 Hours of Sebring is an annual motorsport endurance race for sports cars held at Sebring International Raceway, on the site of the former Hendricks Army Airfield World War II air base in Sebring, Florida. The event is the second round of the United SportsCar Championship and in the past has been a round of the now defunct World Sportscar Championship, IMSA GT Championship and American Le Mans Series. In 2012, the race was the opening event of the FIA World Endurance Championship. Given the information above, choose from the list below the object entity that exhibits the relation 'sport' with the subject '1987 american racing series season'. Choices: - auto racing - formula one - motorsport - nascar
auto racing

(Question)
Information: - Ristar, released as in Japan, is a platform game developed by Sonic Team and published by Sega for the Sega Genesis, which released worldwide in February 1995. A Sega Game Gear game, of the same name and genre, "Ristar", was also released, which shared similar themes, while possessing different level design and gameplay mechanics. - A Platform game (or platformer) is a video game which involves guiding an avatar to jump between suspended platforms and/or over obstacles to advance the game. The player controls the jumps to avoid letting the avatar fall from platforms or miss necessary jumps. The most common unifying element of games of this genre is the jump button, but now there are other alternative like swiping in touchscreen. "Jumping", in this genre, may include swinging from extendable arms, as in "Ristar" or "Bionic Commando", or bouncing from springboards or trampolines, as in "Alpha Waves". These mechanics, even in the context of other genres, are commonly called "platforming", a verbification of "platform". Games where jumping is automated completely, such as 3D games in "The Legend of Zelda" series, fall outside of the genre. - 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. - Freeware is proprietary software that is available for use at no monetary cost. In other words, freeware may be used without payment but may usually not be modified, re-distributed or reverse-engineered without the author's permission. Two historic examples of freeware include Skype and Adobe Acrobat Reader. - Icy Tower is a popular freeware computer game by Swedish game developer Free Lunch Design . It is a platform game set in a tower , where the player 's goal is to jump from one '' floor '' to the next and go as high as possible without falling and plunging off the screen . The higher the player 's character climbs , the faster the tower 's floors move downward and the harder the game becomes . By default , the player controls the character using a keyboard . Given the information above, choose from the list below the object entity that exhibits the relation 'license' with the subject 'icy tower'. Choices: - freeware - proprietary software - sega
(Answer)
proprietary software