Quite, Reinhard.
The book was published. Nobody's permission is needed to buy or borrow a copy. In the book edited by Val, John and Graham, after Keith's death, copyright to the contents is ascribed to Fellside Recordings. Many singers learnt Keith's songs whilst he was alive and he was rightly proud that they were treated in the same way as traditional songs. That was the spirit of them. If any permission to record them is needed then applying to one of the 3 above-mentioned would bring a suitable response.