I think this just means that, if a particular satellite image reveals important military information, the government is allowed to keep it secret -- instead of being REQUIRED BY LAW to make it public, i.e., reveal it to enemies.
I really doubt that the typical "map showing my house" or "aerial view of my community" is in any jeopardy.
It's like the GPS satellites, I guess: a high-grade signal for navy ships and infantry teams -- with a degraded signal for commuters and backpackers.
Ed Poor A former soldier