One of the first projects I did for IBM I was called into a senior executive's office at Ogilvy. My offense? I changed the color of the register mark after IBM so that it matched the logo -- IBM blue.
My instincts were right by my application was wrong.
Register marks, copyright marks, and the rest… they are important and do serve a purpose. However, they don't need to take over your message.
Some good go-bys from font.com
For ®s, TMs and SMs:
In "March of the Doohickeys" an article by Paul Rapp, a lawyer who specializes in intellectual property law, you can read about the purpose of all of these extra doodads.
Bottom line: the marks need to be legible but not overbearing and not a design element of your logo. So if you are designing a bill board, be sure to scale down the size of the register mark accordingly … it doesn't have to be the size of a stop sign. And if you are creating a logo for an LLC my recommendation is to make it look like a "mark" versus part of the name. And always always follow the brand guidelines.
Taking all of my experiences