This is my understanding of the docuмent which I recently read along with the copious footnotes. Without asking, I know that I will be corrected if I am wrong.
Dignitatis Humanae doesn't really say that errors has rights. What it says is that if you firmly believe you are right, you have the right not be coerced to go against your conscience. It's not so much that you have the right to be wrong as it is that you have the right not be brow-beaten into changing your mind.
The problem I have with the docuмent is that it is the brainchild of John Courtney Murray, S.J. who was teaching this to various religious orders of nuns already in the 1940s. What it did was extend the United States' version of religious freedom throughout the Church.
:rahrah: