I'm not sure how this differs from a regular release print. (Perhaps it doesn't?). A dupe negative must be derived from an IP, so therefore this is a regular release print...what am I missing?

Perhaps a duplicate negative differs from an internegative?

 |  IP: Logged

Although the quality of a direct "EK print" made from the original negative is the best you can get, it puts the original negative at risk for damage (e.g., one of the many cement splices breaking during printing).

Release prints made from duplicate negatives can have excellent quality. For "Film Done Right", the proper procedure is to contact print the short pitch original negative (BH-1866 perfs) onto a long pitch master positive (DH-1870 perfs). Then use a (slower) pin-registered step printer to make the short pitch duplicate negatives (BH-1866 perfs). The sound negative is recorded directly onto short pitch sound recording film (KS-1866 perfs). Then contact release prints are made onto long pitch print film (KS-1870 perfs). This method minimizes any slippage in the printers to give the optimum steadiness and sharpness, even with high speed release printing.

KODAK VISION Color Intermediate Film is used for making both master positives and duplicate negatives. It is so sharp and fine grained that properly made release prints are almost equal in quality to direct prints. It is also the film of choice for laser recording of "digital intermediates".
http://www.kodak.com/US/en/motion/products/lab/5242.shtml
http://www.kodak.com/US/en/motion/products/lab/tech5242.shtml
http://www.kodak.com/US/en/motion/support/h1/printing.shtml http://www.kodak.com/US/en/motion/support/h1/printingP.shtml#operations

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John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
e-mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion