premise: 8. This Agreement imposes no obligation upon NIST with respect to information which  (a) was in NIST’s possession before receipt from Discloser;  (b) is or becomes a matter of public knowledge through no fault of NIST;  (c) is received by NIST from a third party without a duty of confidentiality;  (d) is disclosed by Discloser to a third party without a duty of confidentiality on the third party;  (e) is disclosed by NIST with Discloser’s prior written approval or  (f) is developed by NIST without reference to the Proprietary Information disclosed hereunder.