• You will not be able to use it in professional projects. • You will have to attribute the author (mention it) somewhere. • Every webpage and every song are under different free licenses. You must read and understand what they mean, one by one.
• The free license can change at any given moment by the author. • Youtube algorithm, called Content ID, can detect that you don’t have the rights to use that music. • You will not be able to monetize your video or product that uses the music.
The world of royalty-free music on the Internet is complex, as there are a wide variety of types of licenses and it is not always clear which we should stick to. Not playing by the rules can lead to bad surprises, like your video being removed from Youtube or Facebook because of, copyright complaints, and even in the worst case scenario a lawsuit, since the ignorance of the law does not exempt from its fulfillment.