over

.
1. In or at a position above or higher than

The very first one. It simply means the signatures referred to are below, physically, on the page. But it's a somewhat snooty way of saying whose authority is behind it.

It does seem to have a "non-physical" feeling to it, like "over the objections of . . . "

Perhaps further context would reveal that the speaker is objecting that those who authorized the documents were not of

Good. So it's like:
[content]-------------
------------------------

------------------------

(signature: )
?

Exactly. But, you know, this may be figurative, since one thinks of "these documents" as being separate pages. Still, you have the relationship correctly.

It's conceivable that the signatures appeared at the bottoms of each of the several documents.

- A.

Good. Thanks, A!