There are rules when quoting or using the words that someone has written down or recorded. But that limited circle of certainty is broken when that person is the subject for your interview.
The rights of interviewees
In theory, the words or a photograph of a person can be published without their permission (although for photos this does not apply in France and there are an increasing number of bye-laws to protect celebrities, so check).
However, if your work is going to be used for any sort of commercial purposes, then you need their permission. Most celebrities have sold the rights to exploit their image, so if you want to use it, you will have to get permission from whoever holds the rights. Celebrities often have an expensive team to promote and defend the image of their 'property'.
In practice, things are not quite as difficult as it sounds. With the exception of the A-list celebs, who you can't get near, most people are very happy to provide an interview that will promote their work or views. What you are trying to do is make sure that the person knows the purpose to which you plan to put the interview. They might have some strong objection to appearing on your blog if that happens to be associated with a cause that they do not support, so try to spell it out.
So, before you start, make sure the person you plan to interview knows:
I often carry a recorder and always ask for permission before using it. Mostly I am recording in order to supplement my notes - I write a much better interview if I have listened to the recording just before I write. Occasionally I want to use parts of the recording for broadcast and I make sure the interviewee understands. For any broadcaster, this requires a formal approval as they are performing. There is some wriggle-room with this but it is so much better to get written permission - broadcasters will ask you to provide written proof.
I always prepare my questions but I don't stick too rigidly to the questions or the order unless they have been agreed in advance. I have occasionally offered to send the questions in advance but nobody has ever taken up the offer (but I talk to real people, not politicians). These questions can provide a talking point before you start and help relax the subject as they know what is coming and can, to some extent, prepare their thoughts.
When you start writing, remember the laws of libel. If the subject is alive there are some limits to what you can say.
Do not lose too much sleep over this agreement. It is mainly a matter of courtesy and clarity, but if you have some written permission you know where you stand and this should avoid unpleasant surprises if the subject claims they were tricked.
If you plan to provide your interview to any established media then take a copy of their specific agreement. Look on their website as they always have such a document and will make you go back to get it signed before they use your interview.
The text below might provide the basis of your release or permission form (you will need to compose your own to fit the situation):
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