You could just assume all NDAs apply equally well to the spouse. They should just be considered legally one person.
That's the decision of the person providing the Non Disclosure Agreement, not the decision of the people engaging in bonding rituals.
I'm pretty sure it's some combination of the decisions of both parties making the agreement, and the relevant laws.
Recently, LWers Will Ryan and Divia Melwani (now Will and Divia Eden) were married, with Eliezer Yudkowsky officiating.
I've been to 40+ weddings in my lifetime, and this was my favorite ceremony yet. Here is the video, and below is the transcript of Eliezer's... what's it called? "Blessing"?