I have dozens of WWII Britishand Commonwealth sniper photos on my web site and I have listed just the information that you are looking for. Date, location, names, image number and source of the photo (where known). So often I see sniper photos published in books and on the Internet with little or no information, and even worse, with incorrect information. I hope this helps Trebor and others.
Canadian photos taken before 1948 as I recall are no longer copyrighted. Museums and archives and other owners may of course charge fees for their time and effort in making copies. Some charge hefty fees but Canadian copyright law is clear that pre-1948 photos in Canadaare no longer copyrighted.
Sometimes you will see photos from another country e.g. U.S. Photos where copies were deposited in British archives and then British archives claim copyright. They did not create them however.
It is always best to try to get back to the original source and captions. Too often the captions become abbreviated and garbled and photos are frequently cropped, censored etc. The most common problem is that photos taken in safe areas are often passed off as "action" photos. Snipers appear to have often been asked (told) to pose in exposed positions because the photos will look better.
Photographs of Snipers www.captainstevens.com