Lawyers like to insist that you include ™, ® and © trademark/copyright symbols with logos and product names to mark your intellectual property. Unfortunately, these little legal symbols tend to swarm your logo like fruit flies, adding visual noise to the design.
I like the solution used by Jean Louis David, the French chain of hair salons. The designer smuggled the ® and © symbols into the dots above the “i” letters in the logo. It’s a great solution that gets the legalese into the logotype without cluttering its design.
Bonus trivia: The dot above the “i” is called a “tittle.”