relative fame

In the end no one is more famous than Anonymous.

no owner

The poem was published as “Anonymous” because no one would own up to it.

naming rights

With his writing and publishing not going well, he hatched a scheme to begin copyrighting the works of Anonymous as his own.

nearly invisible

She was so much an identity poet she managed to make herself anonymous.

no provenance

I found an old poem in a file, but I couldn't recognize it as mine.