If you plan to make money from the materials, or you would be upset to see others using the materials without your permission, you would want to assert (or register, if available) copyright. If you plan to use the materials as a logo, business name, or slogan (a "mark") in trade, you would want to register it as a trademark.
If you're using a copyrightable work as a mark in trade, you would want trademark protection. Most trademarks are best protected only as trademarks.
Trademark yes copyright no.
If the song is to be registered as a trademark you will need to contact the US Patent & Trademark office. For copyright protection, the US Copyright Office (see related links below).
Copyright.
Aquacoir is protected by patent and trademark, not copyright. The trademark is registered to OMS Investments.
If it is recognizable as a copyright or trademark-protected character, you would need permission from the owner.
Generally, the text on a bumper sticker would be too short to qualify for copyright protection.
There may be a trademark on a particular brand, but not hats in general. Copyright famously does not protect fashion.
you can neither trademark nor copyright a body treatment. You could trademark the name of the treatment or copyright an illustration, written description, or film of the treatment. To protect a method of operation you would have to seek a patent.
A trademark would only be useful if you were using it as a logo, i.e., a mark used in trade.
Generally a trademark wouldn't additionally require a copyright statement; the (tm) or (R) indication would cover it.
You want trademark protection, not copyright protection. In the US, you can apply online via the link below.
The game Operation is protected by copyright and trademark.