This is far from a legal answer, but the last time I looked into copyrighting material, the answer I found was that the material is copyrighted if you declare it as such.

You have a copyright whenever you create something copyrightable. It's merely much easier to enforce if you put a copyright notice on it before you distribute it.

See 10 Big Myths about copyright explained and the U. S. Copyright Office FAQ.

In reply to Re^2: What qualifies as copyrighted material? by chromatic
in thread What qualifies as copyrighted material? by rodion

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