Do they at any point explain how does blockchain solve the unsolvable problem they mention?
Either it's decentralized first-to-submit-ownes-it and it's the same situations as the patent trolls in the software industry, or it's centralized (via KODAK) and any good ol' database will do the trick.
Yes.
I think, it's decentralized first-to-submit-ownes-it and the photographer gets they're proper rights.
In that case, no one use other's photography in free, I guess.
That might work for newly taken photos that are never published until after they have been submitted to and approved by the blockchain.
But the moment the system starts, it will be flooded with claims for existing works by people that don't actually own them.
Edit:typo
That is true.
It will be impossible to identify the owners, Unless there is a way for people to prove their Existing works.