\version "2.11.46"
#(set-default-paper-size "a7" 'landscape)
#(set-global-staff-size 13)


\header {
  title="Title of the score"
  composer="The composer"
  copyright="Copyright footer"
  scorenumber="Number of the score"
  publisher = "The publisher"
}

#(define (page-number-for-label layout label)
  (let* ((table (ly:output-def-lookup layout 'label-page-table))
         (label-page (and (list? table) (assoc label table)))
         (page-number (and label-page (cdr label-page)))
        )
    page-number
  )
)
  

#(define copyright-footer-table '())

#(define thisPageCopyrightFooter-music #f)
#(define is-copyright-page #f)
#(let ((copyright-table (list)))
  (set! is-copyright-page
    (lambda (layout props arg)
      (ly:make-stencil `(delay-stencil-evaluation ,(delay (ly:stencil-expr
          (begin
            (if (and (null? copyright-table) 
                     (not (null? copyright-footer-table)))
              (for-each (lambda (label)
                (let* ((page-number (page-number-for-label layout label)))
                  (if page-number 
                    (set! copyright-table (cons page-number copyright-table))
                  )
                )
              )
              copyright-footer-table)
            )
            (let* ((page-number (chain-assoc-get 'page:page-number props -1)))
              (if (memq page-number copyright-table)
                ; This is a copyright page!
                (interpret-markup layout props arg)
                empty-stencil
              )
            )
          )
        )))
        (cons 0 0)
        (cons 0 0)
        ;(ly:stencil-extent (interpret-markup layout props "XXX") Y)
      )
    )
  )
  (set! thisPageCopyrightFooter-music
    (lambda (parser) 
      (let* ((label (gensym "copyrightfooter")))
        (set! copyright-footer-table (cons label copyright-footer-table))
        (make-music 'Music 'page-marker #t 'page-label label)
      )
    )
  )
)
thisPageCopyrightFooter = #(define-music-function (parser location) ()
  (thisPageCopyrightFooter-music parser)
)



\paper {
  oddFooterMarkup = \markup {
    \column {
      \line {"---------------"}
      %% publisher header field only on title page. This does not add 
      %% space if no markup is shown:
      \on-the-fly #first-page \fill-line {
        \fromproperty #'header:publisher
        \null
      }
      \line {"---------------"}
      %% copyright on pages with markers, reserves space even if no 
      %% copyright is inserted on a page:
      \on-the-fly #is-copyright-page \fill-line {
        \fromproperty #'header:copyright
        \null
      }
      \line {"---------------"}
    }
  }

}



\thisPageCopyrightFooter
\markup "With Copyright footer and publisher"

\pageBreak
\markup "No Copyright footer, no publisher"

\pageBreak
\thisPageCopyrightFooter
\markup "With Copyright footer, no publisher"