title_body: Can I use a Youtube still image in my ebook Here is another copyright question. Can I use a still image (which I will further modify, such as convert to black/white and apply filters from graphic software) from a standard youtube licensed video in my ebook? Can I use a CC licensed image?
  
  The ebook is to be published in German language. I like it to be available in Germany, Austria and Switzerland.
upvoted_answer: This answer does not present any legal advice.
  In fact your post contains two questions.
  Speaking of the youtube license part you should definetly add information about the country you want to publish the eBook.
  
  CC licenses come with different characteristics, regulating the rights and responsibilities.
  The use of CC licensed images may be limited in terms of content derivation, derived licenses, commercial use and all diverse combinations of those. The exact license versions can be found at creativecommons.org