Interesting. According to the sheet the name of Guido Karp is remakable, because Guido Karp is a German well known band-photographer. He also photographed AC-DC and other stars. So your pic is professional made, by an official photographer.
Some other photographers offer their photos from various locations and from different time-periods on their websites. They are all high-quality copies from the original negatives, which are holded by the photographers themselves.
Guenther Zint for example, who had photographed many stars in Germany, incl. The Beatles, The Rolling Stones in the Sixties. You can choose your favourite pics on the photographers website and you´ll receive them in a cardboard-folder. There is also Wolfgang "Bubi" Heilemann. He shooted Abba, The Sweet and other well known stars for the German teenager-magazine "BRAVO" during the late Sixties and Seventies.
Other well-known photographers are Dezo Hofman, Anton Corbijn, Annie Leibowitz and not to forget, musician Bryan Adams.