premise: a. GENERAL EXCEPTIONS.  The disclosure and use restrictions imposed in this Agreement do not apply to Proprietary Material that:  (a) Pinetree can show by documentary evidence was already in Pinetree's possession before the disclosure hereunder to Pinetree;  (b) is hereafter disclosed to Pinetree by a third party who has no duty of confidentiality to STI in respect of it; or 