Steve,
I really doubt that the copyright extends to excluding people from taking a photo of the structure! What if one is taking another view of Paris and the tower is visible, is that also not allowed or do you write to the owners of the tower and ask them to arrange for it to be covered up in advance!
I expect it is more to prevent unofficial tacky souvenirs (as opposed to official tacky souvenirs).
As I expected, a stupid meaningless law. Yes in principle.......but in practice no. I haven't yet seen any camera touting tourists being rounded up by the riot police for taking their snapshots.