Music license words are often confusing because they sound more absolute than they are. Royalty-free does not always mean free of charge. Copyright-free is often used casually, even when copyright still exists. Public-use can mean different things depending on the service. Creators should read the practical permissions, not only the label.
Royalty-free usually means the user does not pay a repeating royalty for each use after receiving the license. It may still require a subscription, purchase, attribution, or use limits. Public domain means no exclusive copyright claim remains, but services may use public-domain-style terms for generated works with specific restrictions such as no Content ID registration.
For BGMFREE, the important promise is practical: free generated tracks can be used freely as background music, while users should not claim exclusive ownership or register public tracks into rights-claim systems. That keeps the public library useful for everyone.
Creators should save evidence. Keep the download page, track ID, creation date, and license text. If a video receives a claim later, those records are much easier to use than a file name saved on a hard drive with no context.
The safest habit is to ask three questions before using any BGM: Can I publish with it? Can I monetize my content with it? Can someone else later block me from using it? A good music site should answer those questions clearly before the download button, not after.