Prophecy Involvement- There are only two?

[Chys Sage Lattes]

No: HPFGUIDX 172161

How does the one who records the names on the prophecies know that it 
is the "Dark Lord" and "Harry Potter(?)" if he doesn't know the full 
contents of the prophecy, as Dumbledore told Harry in the Weasley's 
smelly broomshed, 'only two people in the world know the full contents 
of the prophecy now?'

I would guess that Dumbledore had shared some of this information but 
knowing how jealously he's guarded it, I doubt he would have done such 
a thing, knowing how important it is.

-Chys, apologizing in advance if anyone already asked this, but I 
didn't find it anywhere and am very curious.