I have been doing a ton of research trying to find some straight forward answers on copyright and other legal things that go with logo design. It’s all very stressful to wade through. Here’s one thing I read about:
• If you edit a font or any part of a font for a logo, you may be violating copyright law, even if you own a license to use the font. In most cases, purchasing the font simply means you will be able to use it on one computer without legal issues. It’s also okay to print text with the font. Editing is a whole different story. If you are going to edit a font, you must first get the permission of whoever created it. Once you obtain a user agreement that states it’s okay to edit any part of the type, you’re golden.
This is just one of the complicated issues that face designers. To be honest, I wouldn’t have given it much thought when it comes to a font in a logo. If you’d like to read more about it, Just Creative Design has a very nice article on all that copyright stuff. One things that’s certain it that we all have to do research on what we do, and make sure we don’t break any rules.