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CompanyPermissionSourceGames covered in PermissionsDate of RetrievalNotes
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Amplitude StudiosYou may run ads or other revenue streams that don’t interfere with a user’s access to the video, subject to the “No Licensing” guideline below.http://www.amplitude-studios.com/FAQ/Legal-Stuffhttp://en.wikipedia.org/wiki/Endless_Space20/11/2013They have a lot of small rules in here, recommend you read the text in full.
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BlizzardThe only exceptions to this rule are if you participate in partner programs with YouTube, Justin.tv, Blip.tv, Own3d.tv, or Ustream.tv (the "Production Websites") whereby a Production Website may pay you for views of a Production if you are accepted into their partner program.http://us.blizzard.com/en-us/company/legal/videopolicy.htmlhttp://en.wikipedia.org/wiki/Blizzard_Entertainment#Titles16/02/2013Only applies to videos hosted on YouTube, Justin.tv, Blip.tv, Own3d.tv, Ustream.tv
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Edmung McMillen (Team Meat)i Edmund McMillen to here by allow anyone in the world to post video of any project ive made to youtube and monetize it as they wish!http://www.formspring.me/EdmundM/q/426167225297162040http://en.wikipedia.org/wiki/Edmund_McMillen18/05/2013Only applies to videos hosted on YouTube. Due to the wording it appears to apply to what Edmund McMillen has worked on, but as many of his older projects involved teams he is no longer a part of so his ability to make this judgement could be debated.
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Frictional GamesPutting advertisements on my Let's Play videos on youtube. So that is a yes? Yes, you can do that.http://www.frictionalgames.com/forum/thread-20089.htmlhttp://en.wikipedia.org/wiki/Frictional_Games#Games16/02/2013As currently worded, this only applies to YouTube
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Galactic CafeGalactic Cafe gives its full permission for anyone to record, stream, and upload any videos of its game to anywhere on the internet, and to monetize these videos with ads. No need to ask our permission, go forth, and cultivate revenue. Sow the seeds of your own financial viability. Monetize, and all is right with the world.http://www.galactic-cafe.com/2013/10/video-monetization/http://www.galactic-cafe.com/games/22/10/13
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MojangYou may make money using your videos of our Game so, for instance by putting ads on them, as long as you also add your own unique content to the video, such as audio commentary. The amount you add must also be enough to make it fair and worthwhile for someone to pay for it or for you to make money from it. For example you couldn‘t just include your logo, web address or indent but you could add an audio commentary or your own music if you are creating a music video.https://account.mojang.com/termshttp://en.wikipedia.org/wiki/Mojang#Games16/02/2013
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Paradox InteractiveWe permit third-party use and monetization of things like "Let's Play" Videos under the restriction that it is clear that Paradox Interactive is the copyright holder of any material shown.http://www.youtube.com/user/Paradoxplazahttp://en.wikipedia.org/wiki/Paradox_Development_Studio#List_of_video_games16/02/2013I am only linking here to the games developed by Paradox as I am unsure if this applies to games only published by Paradox Interactive, and suspect it does not (as the actual developers probably keep the rights to the content).
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Riot GamesYou may run ads or other revenue streams that don’t interfere with a user’s access to the video, subject to the “No Licensing” guideline below. . . . Generally, you cannot license your videos to any third party for a fee or other value without our approval. However, there are important exceptions: Partner programs with YouTube or the following streaming websites: own3D.tv, Ustream.tv,Twitch.tv, Justin.tv, Blip.tv (no prior permission from us required).http://www.riotgames.com/company/legal-jibber-jabberhttp://en.wikipedia.org/wiki/Riot_Games#Games16/02/2013Only applies to videos hosted on YouTube, Justin.tv, Blip.tv, Own3d.tv, Ustream.tv
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Robot EntertainmentYou may upload review and walkthrough ("Let's Play") style videos of Robot Entertainment's games, and may monetize (place ads on/next to) the videos. http://support.robotentertainment.com/customer/portal/articles/341316-i-want-to-make-gameplay-videos-of-one-of-robot-entertainment-s-games-and-i-d-like-to-place-ads-on-these-videos-am-i-allowed-to-do-thathttp://en.wikipedia.org/wiki/Robot_Entertainment#Games16/02/2013
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Tripwire interactiveThis applies to the following websites/services at this time (and ONLY these services): Youtube Justin.tv Blip.tv Own3d.tv Ustream.tv We are happy for anyone to use recorded video material from our games as long as the video is somehow related to the game(s) in question (e.g. review, preview, a Let’s Play, or some other similar type), is recorded at a decent resolution and credits the game. We are also happy for anyone to use music from the games in connection with videos related to our games. However music used outside of videos of our games is not allowed unless specific permission is requested.http://www.tripwireinteractive.com/policies/http://en.wikipedia.org/wiki/Tripwire_Interactive#Games_developed16/02/2013Only applies to videos hosted on YouTube, Justin.tv, Blip.tv, Own3d.tv, Ustream.tv.
As with Paradox, this may not apply to games published by Tripwire but not developed.
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UbisoftYou are free to monetize your videos via the YouTube partner program and similar programs on other video sharing sites. http://forums.ubi.com/showthread.php/773564-Ubisoft-policy-on-YouTube-videoshttp://en.wikipedia.org/wiki/List_of_Ubisoft_games30/06/2013Must follow some basic guidelines on content:
Do not take assets from our games (e.g. voice, music, items) and distribute them separately.
Do not charge users to view or access your videos.
Do not sell or license your videos to others for a payment of any kind.
Behave like a decent human being. Absolutely no racist, sexist, homophobic, or offensive content.
Please keep your videos focused on our games, and away from overtly controversial topics.
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ValveYou are free to monetize your videos via the YouTube partner program and similar programs on other video sharing sites. Please don't ask us to write YouTube and tell them its fine with us to post a particular video using Valve content. It's not possible to respond to each such request. Point them to this page.

Of course this policy applies only to Valve content. If you include someone else's content in your video, such as music, you will have to get permission from the owner.
http://www.valvesoftware.com/videopolicy.htmlhttp://en.wikipedia.org/wiki/List_of_games_developed_by_Valve16/03/2013
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