Unregistered Hybrid means what?

[Optimist]

Hi. What is meant by unregistered Hybrid. I know what the language says. Someone has hybridized these orchids but has not registered them for some reason. If I know the name, the cross, the person who hybridized them and so on, would I be able to enter them in a show as "Unregistered Hybrid?"

Or, is something wrong with them? Is it "an experiment gone wrong?" Why is it not registered?

I found an orchid I totally love and it is an unregistered hybrid. That is why I have asked.