(a) Notwithstanding the provisions of section 106, it is not an infringement of copyright for an authorized entity to reproduce or to distribute in the United States copies or phonorecords of a previously published literary work or of a previously published musical work that has been fixed in the form of text or notation if such copies or phonorecords are reproduced or distributed in accessible formats exclusively for use by eligible persons. (b) (1) Copies or phonorecords to which this section applies