Legally, you cannot download a full, free PDF of the official libretto without purchasing it or renting digital perusal materials.
Camelot (1960) is NOT in the public domain. The rights are administered by The Alan Jay Lerner Estate and Frederick Loewe Estate, typically through licensing houses like Music Theatre International (MTI) or Concord Theatricals.
Do you need the entire libretto, or just the lyrics? If you’re an actor learning "Camelot" (the song), you don’t need the book—you need the (Hal Leonard). If you’re a director, you need the Complete Script .
: The "perfect" knight whose primary flaw is a very human infidelity.