Here is a method that may work for you. It's extremely cheap and simple.
It's called the "Poor man's copyright"
Write it down.
Seal it in an envelope.
Mail it to yourself. (Certified if you prefer.)
When it arrives DO NOT OPEN IT.
Place it somewhere safe until needed.
There are no guarantees this method will work. However, I have heard stories....a professor from college once told me about this.
If it's a great slogan and you really want to trademark it. Go for it!
How do I copyright a name, title, slogan or logo?
does not work, i used this method for some of my projects and was told, this method is no longer any good in court!
1. Slogans are perfectly fine subject matter for copyright.
2. "Poor man's copyright" is a myth.
Mail yourself some envelopes with removable tape. When you see something you like, write it on a piece of paper and put it in the envelope. Seal the envelope. Doh!
With respect to a name, a title or a slogan, you don't. I get the impression that you may not understand that copyright and trademark are two different things. Names, titles, slogans, or logos, are trademarks when used in commerce in connection with goods and services and serving as a distinctive indicator of the source or origin of those goods and services.
There may also be a copyright in a logo, in addition to a trademark.
If one is using a trademark, one may seek to have the trademark registered. In the US, a registration application can be based on actual use, or intent-to-use.
But a name, title, or slogan, divorced from use or intent to use as a trademark is not subject to copyright or trademark protection.


