Share 'Copyright of Photography'

Is there anyone out there that has a good grasp of photographic copyright.  1. Does it expire 70 years after the death of the photographer? 2. Is it possible to acquire the copyright of images that comply with Fig.1 ? 3. Are regulations international? As Neg/Pos photography means that it is possible to have duplicates can any one person or organisation own the copyright? Does the owner of a Dague…