But trademarks are very different.
Here's some advice via the design*sponge blog from Amy J. Everhart, founder of a Nashville, Tennessee, law firm to counsel clients in the creative industries, entrepreneurs, inventors, business owners, and others in the areas of copyright, trademark, entertainment, the arts and the Internet. She is the author of the copyright, trademark, and entertainment law blog “Lightbulb Moments,” located at www.aeverhart.com/lightbulbmoments.
Amy says, "Trademark issues can arise in several contexts in the design world. You might use a trademark to identify the source of a product, such as a line of note cards or a piece of jewelry. Or you might use a trademark to identify your business, such as an online store or a design firm, where you sell your artwork or provide your design services. (A related concept is trade dress, the distinctive color, shape, packaging, design, or other visual characteristics of a product that identify the source of the product, such as the distinctive shape of the Cola-Cola bottle. David Yurman has successfully sued on Trade Dress issues.)
Below linked is some of the trademark basics every business owner should ponder.Design*Sponge » Blog Archive » biz ladies 09: trademark 101 for designers.