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Valve Corporation
Type	Private
Founded	Kirkland, Washington, USA (1996)
Headquarters	Bellevue, Washington, USA
Key people	Gabe Newell, co-founder and managing director
Industry	Software & Programming
Products	Half-Life Team Fortress Classic Team Fortress 2 Counter-Strike Day of Defeat Deathmatch Classic Portal Steam Half-Life 2 Source engine Valve Anti-Cheat
Revenue	$70 million USD (2005)
Employees	144[1]
Website	www.valvesoftware.com

Valve Corporation is an American video game developer based in Bellevue, Washington, USA, made famous by its first product, Half-Life, which was released in November 1998.

Valve was originally an L.L.C., based in Kirkland, Washington, after the company became a corporation in 2003 they moved away from it's original location to Bellevue, Washington. The city of Bellevue, Washington also served as the homebase for their original publisher Sierra On-Line, Inc.

Half-Life's success was followed by developing mods, spin-offs, and sequels including Half-Life 2. Only two fully produced games, Half-Life, Half Life 2, have been released by Valve, along with a number of episodic, multiplayer, expansion, and campaign titles including: Half Life 2: Episode One, Half Life 2: Episode Two, Portal, Team Fortress Classic, Team Fortress 2, Counter-Strike, Counter-Strike: Condition Zero, Counter-Strike: Source, Day of Defeat, Day of Defeat: Source, Ricochet, Half-Life 2: Death Match, Half-Life 2: Lost Coast, Half-Life: Blue Shift and Deathmatch Classic.

Main article: Half-Life

Long-time Microsoft employees Gabe Newell and Mike Harrington founded Valve on September 24th, 1996.^[2] After securing a license to the Quake engine (through the help of friend Michael Abrash of id Software) in late 1996, they commenced working on Half-Life. Originally planned for release in late 1997, Half-Life launched on November 19, 1998. Valve acquired TF Software PTY Ltd. in May of 1998, the makers of the Team Fortress mod for Quake with the intent to create a standalone Team Fortress 2 game. The Team Fortress Classic mod, essentially a port of the original Team Fortress quake mod, was released for Half-Life in 1999. Team Fortress 2 was released 2007-10-10, bundled with Half-Life 2: Episode Two along with Portal.

Valve continued work on Half-Life, releasing several more extensions to the game and collaborated with other developers to port it to other platforms. They also took on-board the development of the highly popular Counter-Strike and Day of Defeat Half-Life mods.

Main article: Steam (content delivery)

Valve announced its Steam content delivery system in 2002. At the time, it looked to be a method of streamlining the patch process common in online computer games. Steam was later revealed as a replacement for much of the dated framework of WON and Half-Life multiplayer and also as a distribution system for entire games.

Between 2002 and 2005, Valve was involved in a complex legal showdown with its publisher, Vivendi Universal (under Vivendi's brand Sierra Entertainment). It officially began on August 14, 2002 when Valve sued Sierra for copyright infringement, alleging that the publisher illegally distributed copies of their games to Internet cafes. They later added claims of breach of contract, accusing their publisher of withholding royalties and delaying the release of Counter-Strike: Condition Zero until after the holiday season.

Vivendi fought back, saying that Gabe Newell and marketing director Doug Lombardi had misrepresented Valve's position in meetings with the publisher. Vivendi later countersued, claiming that Valve's Steam content distribution system attempted to circumvent their publishing agreement. VUG sought intellectual property rights to Half-Life and a ruling preventing Valve from using Steam to distribute Half-Life 2.

On November 29, 2004, Judge Thomas S. Zilly of U.S. Federal District Court in Seattle, WA ruled in favor of Valve Corporation. Specifically, the ruling stated that Vivendi Universal and its affiliates (including Sierra) were not authorized to distribute Valve games, either directly or indirectly, through cyber cafés to end users for pay-to-play activities pursuant to the parties' current publishing agreement. In addition, Judge Zilly ruled that Valve could recover copyright damages for infringements without regard to the publishing agreement's limitation of liability clause.^[3] Valve posted on the Steam website that the two companies had come to a settlement in court on April 29, 2005.^[4] Electronic Arts announced on July 18, 2005 that they would be teaming up with Valve in a multi-year deal to distribute their games, replacing Vivendi Universal from then onwards.^[5]

As of September 2, 2007 over 200 PC games are available on Steam, and there are approximately 13 million active users.^[6]

• Steam
• Valve Anti-Cheat
• List of Half-Life mods
• List of Half-Life 2 mods
• PowerPlay (technology)
• Source engine
• List of games that use the Source engine

• Official Homepage of Valve Corporation
• Official Steam Site