Transition Provisions

Can researchers continue to access existing databanks or repositories that are maintained by covered entities, even if those databases were created prior to the compliance date without patient permission or without a waiver of informed consent by an Institutional Review Board (IRB)?
If research subjects' consent was obtained before the compliance date, but the Institutional Review Board (IRB) subsequently modifies the informed consent document after the compliance date and requires that subjects be reconsented, is authorization now required from these previously enrolled research subjects under the HIPAA Privacy Rule?
Were there Privacy Rule compliance deadlines in 2004?