Christen and Luis are right - you do not need to put a copyright symbol on your hub.
If it is your creative work (prose, poetry, photographs, videos, drawings, illustrations, etc.) you automatically own all rights to it. It is up to you whether you grant permission to another to quote or cite your work.
When someone publishes your work and passes it off as their own, it is a violation of copyright law, regardless of whether you put a little symbol on the hub or photograph. Moreover, such a symbol will not deter the most egregious thieves of content, as we have recently seen.
Anyone may file a DCMA complaint when their work is stolen, regardless of a formal copyright.