Editing Archived footage

[tomottoe]

Hi
I'm trying to work with a school on events they are livestreaming--for archived events, is there a way to edit the footage online; or can I download it, clean it up and re-post it? What file format is an archived livestream event recorded in?

Sorry for the rudimentary questions but I'm not getting satisfying answers from the school's tech dept.

TIA
cheers
--tom