Images, audio, music, and gameplay footage from Dustforce are licensed under the Creative Commons Attribution-NonCommercial-ShareAlike license. This means you are free to use, modify, and share said content as long as you provide attribution (details below), use it for non-commercial purposes, and share any derivative works under the same license.
For monetized Youtube videos, you are free to use visual content from Dustforce. If you want to use music from Dustforce in a monetized video, please contact firstname.lastname@example.org.
Please attribute content to "Hitbox Team". For music, you can instead attribute it to "Lifeformed". It's also appreciated if you also link to our websites (http://hitboxteam.com and http://lifeformed.com, respectively), or our Twitter accounts (@hitboxteam and @lifeformed).