® versus TM and SM: A Guide To Proper Trademark Use
If you’re unclear about when to use ®, ™ and other trademark identifiers, have a look at “A Guide to Proper Trademark Use” a brief Web page by Gregory H. Guillot, at www.ggmark.com/guide.html.
A more in-depth (but still clear) explanation comes from Crestron at www.crestron.com/downloads/pdf/misc/guide_to_trademark_use.pdf.
Jay Nelson is the editorial director of PlanetQuark.com, and the editor and publisher of Design Tools Monthly. He’s also the author of the QuarkXPress 8 and QuarkXPress 7 training titles at Lynda.com, as well as the training videos Quark includes in the box with QuarkXPress 7 . In addition, Jay writes regularly for Macworld and Photoshop User magazines and speaks at industry events.