As far as I know he was able to correspond fairly freely, but all of mail was being read (which is standard practice for high-security prisoners I believe). In

As far as I know he was able to correspond fairly freely, but all of mail was being read (which is standard practice for high-security prisoners I believe). In my other comment I linked to an author who corresponded with Kaczynski and wrote down his experiences: https://news.ycombinator.com/item?id=36273216 https://news.ycombinator.com/item?id=36273216 He also published some books (Techno1ogica1 Slavery, Anti-tech Revolution), which is his manifesto with some additional essays and letters. > Who holds the rights to something written in prison in the US? The author; nothing changes about that.