In this topic we look at how keywords are added.
Your questions answered
No anyone with edit rights to a collection can add keywords to videos in it. Furthermore, when videos are uploaded by contributors they choose which keywords assigned from their library will be included on the channel.
This gives contributors a responsibility to ensure that the keywords that they select for inclusion on the channel are relevant to other users and that similar keywords are spelled consistently. It is useful to know that Dartfish software allows you to export a keyword set that can be imported into the libraries of all those who upload.