Hey everybody, a newbie here.

I was at the international IT conference, to which I acquired all needed permissions from main organizer. Some shots are detailed clips for which I don't need Model Releases as nothing/no one can be recognized. But I have also made clips of speakers on the podium, in which they can identify themselves and now I'm struggling with the idea of contacting those speakers and asking them for MR for commercial use.

My question is, if they would not agree with clips being used on microstock agencies, can they ask me/agencies to take them down? Am I obligated to take them down?
Thanks in advance for any reaction!