How does the "Magna Carta" (1215) affect us in the 21st Century?

Excerpted paragraphs from NPR coverage of 800th anniversary of seminal document in human laws and government:
"A new state of things begun in England; such a strange affair as had never before been heard; for the body wishes to rule the head, and the people desired to be masters over the king ..."
Demanding freedom was so 13th century. That's when a poetic monk wrote this in the Melrose Chronicle, a record of negotiations between the unpopular King John and his rebel barons at Runnymede. The resulting Magna Carta of 1215 was meant to provide a short-term solution for a royal problem, but it accomplished much more: It laid the very foundations for democracy the world over.
On the face of it, the original Magna Carta — the "Great Charter" — was a peace treaty that lasted about two months and applied to just a handful of people. It might've been forgotten by history, but it established the principle that everybody, including the king, was subject to the law. And, perhaps most famously, that all "free men" had the right to justice and a fair trial.
The ideas it came to embody — freedom and human rights — have ensured that the Magna Carta remains a universal touchstone of liberty some 800 years later. Early pioneers to America took the principles of the Magna Carta with them, which provided a framework for the Declaration of Independence and the Bill of Rights. And the iconic document continues to inspire today.
The Library of Congress is celebrating the 800th anniversary of the Magna Carta with an exhibition through mid-January 2015, featuring an original 1215 copy of the text normally housed at Lincoln Cathedral in England.
Now, as the British Library prepares to reunite the four surviving copies of the Magna Carta for the first time in history ahead of its major exhibition, "Magna Carta: Law, Liberty, Legacy" from March 13 to September 1, 2015 a new chapter begins in this 800-year-old story.
Tim Berners-Lee, British inventor of the World Wide Web, is among those suggesting a Magna Carta for the Internet to keep it open and free in the face of government and corporate attempts to control it. This idea of a Digital Bill of Rights has also been taken up by the British Liberal Democrats, part of the governing coalition. Julian Huppert, Lib Dem MP for Cambridge, says the move would "protect our fundamental liberties online."
http://www.npr.org/2015/01/04/374968529/a-new-state-of-things-celebrating-800-years-of-the-magna-carta