It depends how you use it. Wikipedia makes frequent use of copyrighted material (video game screenshots, music clips) but they get away with it because they are covered under the "Fair Use" laws, whatever those are.

You'll notice the reasons they give for being covered are any combination of the following:
- The video/screenshot/music is of low quality
- It is being used only to demonstrate certain things about the subject
- The video/screenshot/music is not detailed or long enough to be copied for any useful purpose
- The video/screenshot/music is not interfering with the sale of the subject