FYI: The law on copyright is that once published, it is automatically copyrighted. There is no requirement to register it, although it might be possible to do so.
Trademark is similar, but a "first use" only applies to the location where it is used. For that reason, most everyone formally registers a trademark for anything considered important. That way, it applies nationwide (or sometimes statewide, or even worldwide, where applicable).
Copyright registering or not is pretty much irrelevant.
FYI: The law on copyright is that once published, it is automatically copyrighted. There is no requirement to register it, although it might be possible to do so.
Trademark is similar, but a "first use" only applies to the location where it is used. For that reason, most everyone formally registers a trademark for anything considered important. That way, it applies nationwide (or sometimes statewide, or even worldwide, where applicable).
Copyright registering or not is pretty much irrelevant.
FYI.
BTW, Thanks for doing the research on this.