Valve

Valve Corporation, also known as Valve Software, which makes games under the name Valve, made Half-Life, Counter-Strike, Portal, Day of Defeat, Team Fortress, Left 4 Dead, and Dota. Valve is happy for you to make fan works of their games, as long as you don't make any money off of those fan works if you post them outside of certain ones of their proprietary platforms.

Statements

2024

Valve appreciates the community of Subscribers that creates fan art, fan fiction, and audio-visual works that reference Valve games ("Fan Art"). You may incorporate content from Valve games into your Fan Art ... but solely on a non-commercial basis. ... Commercial use of some Valve game content is permitted via features such as Steam Workshop or a Steam Subscription Marketplace.

Statement sources

Current Steam Subscriber Agreement (as of late September 2024)—https://store.steampowered.com/subscriber_agreement

Works

• Half-Life (1998)
• Team Fortress Classic (1999)
• Ricochet (2000)
• Counter-Strike (2000)
• Deathmatch Classic (2001)
• Day of Defeat (2003)
• Counter-Strike: Condition Zero (2004)
• Counter-Strike: Source (2004)
• Half-Life: Source (2004)
• Half-Life 2 (2004)
• Half-Life 2: Deathmatch (2004)
• Day of Defeat: Source (2005)
• Half-Life 2: Lost Coast (2005)
• Half-Life Deathmatch: Source (2006)
• Half-Life 2: Episode One (2006)
• Half-Life 2: Episode Two (2007)
• Portal (2007)
• Team Fortress 2 (2007)
• The Orange Box (2007)
• Left 4 Dead (2008)
• Left 4 Dead 2 (2009)
• Alien Swarm (2010)
• Portal 2 (2011)
• Counter-Strike: Global Offensive (2012)
• Dota 2 (2013)
• Counter-Strike Nexon: Studio (2014)
• The Lab (2016)
• Artifact (2018)
• Dota Underlords (2020)
• Half-Life: Alyx (2021)
• Artifact: Foundry (2022)
• Aperture Desk Job (2023)
• Counter-Strike 2 (2024)