You know that now notorious error message you sometimes see on YouTube videos claiming the music in a video was copyrighted and had been disabled?
Out of curiosity I clicked the Learn More link and was told this on their Copyright Tips page:
What is copyright infringement?
Now now, nobody likes a rhetorical question, do they?
Copyright infringement occurs when a copyrighted work is reproduced, distributed, performed, publicly displayed, or made into a derivative work without the permission of the copyright owner.
Ah that nagging little thing called "fair use" is such a spanner in the works, isn't it?