I am writing a book on my recent research. I am going to register a copyright for this work and publish the book through a major publishing house (Springer). My editor and I have agreed in our contract that I am the copyright holder.
I have been fortunate to use many free software tools while completing my research for this work, so I want to place the logos of these projects next to a thank-you note in the acknowledgements of my book. In some cases this is easy because the copyright holder's license states I am free to use their logo in order to refer to their company. However some logos are licensed under a GNU GPL share-alike license and I do not see any specific terms relating to using the logo to refer to their work. I know this means I can't modify or redistribute their logo unless I release my work under the same license - but is there some clause I am missing when it comes to referring to their project?
I would imagine there would be no concern, since I am using their logo to express how greatful I am to their project and I want people who read my book to be aware that these are the third party tools which have been so helpful for me. But I also know that intellectual property licensing and conditions is often given a lot of weight by developers of such projects (For example).