Whatever I write is copyright me, and whatever you write is copyright you. I don’t think anything I write here can change that, and if this text has any influence on the situation in other jurisdictions that I don’t know about then my intention is that the first sentence obtains.
I think blogging implies a general license to do bloggy things with the text. If you submit a comment then I’ll act as if I have a license to edit that comment and quote it in other comments. I expect that my articles can be quoted on other blogs that discuss them or refer to them. All fair use.
Oh, and in the unlikely event that you do want to license my copyright material then just ask; I’ll almost certainly say yes.