No more, surely, than you would have done so anyway, due to that Ubuntu logo visible in the screenshot (or in your case, the Fedora logo -- copyright Red Hat). And, of course, Mozilla's -- that darned Firefox icon in the panel. And, probably, several dozen anonymous icon designers who haven't explicitly released their work under a Free license. And, oh dear, I seem to have violated Red Hat's trademark myself, by publishing (in this comment) the word "Fedora" without the ® symbol or the words "Fedora and the Infinity design logo are trademarks of Red Hat, Inc.", as I am required to do by their trademark guidelines. Not to mention....
Etc, etc, etc. Being that paranoid over IP leads nowhere, fast. And whilst IANAL, I was under the impression that these sort of uses are more than covered by Fair Use in the USA, and its equivalent in other jurisdictions.
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