A logo or trademark is any photograph, word, or symbol used to identify a brand, service, or product. You need permission to use a logo unless it is for editorial or information purposes, such as when a logo is used in a written article or being used as part of a comparative product statement.
Other than these two instances, you should never assume you can use a trademarked logo. A person or company should never use a trademark or logo without written permission from its owner. To get permission and avoid trademark infringement...