I need to use images related to "cricket umpire signals" in my paper. I want to create a new image by putting some of these small images together along with graphs and comments next to them. But my concern is the copyright issue when i take those small images from websites.
I found the images on many websites such as BBC or WordPress blogs.
But BBC says that they don't own all of the images on their website, and they don't reply back fast. and on other websites, there is nothing specifically said regarding the copyright license.
Also, i asked someone who has used such images in his paper about the issue, and he replied back "they are in the public domain and a permission is not required" along with the following link.
But I'm not sure how acceptable/reliable is his answer regarding this issue.
I'm writing the paper for an ECML/PKDD workshop (computer science) in europe and I live in Germany.