premise: 4. Recipient shall have no obligation with respect to information that:  (a) was in the public domain at the time of Discloser's communication thereof to Recipient;  (b) entered the public domain through no fault of Recipient subsequent to the time of Discloser's communication thereof to Recipient;  (c) was in Recipient's possession free of any obligation of confidence at the time of Discloser's communication thereof to Recipient;  (d) can be shown by documentation to have been independently developed by the Recipient without the use of or reference to any Confidential Information; or 