Della:
It is not "responsibility" that would be cause by "leakage of information".
Leakage is exemplary of "irresponsibility".
The other sentences could be written this way, at least, this is how I would express the same meaning:
1) The interested parties agreed to the terms of the contract.
(2) The responsibilities of the several parties are to be conducted
in accord with regulations and law
I could, if I wanted, use the word "prevails" to refer to negotiations of a contract,
but it is much easier to say that the parties agreed to the terms of the contract.
(Hope that helps)