That is the text of the 1215 MC.
This http://www.archives.gov/exhibits/featured_documents/magna_carta/translation.html
is the text of the 1297.
"Odd though that the authors get the history so wrong. This is the 1297 Magna Carta or Confirmatio Cartarum of Edward I issued by Parliament. Not the original Magna Carta of 1215 issued by King John."