A process design kit (PDK) is a set of files used within the semiconductor industry to model a fabrication process for the design tools used to design an integrated circuit. The PDK is created by the foundry defining a certain technology variation for their processes. It is then passed to their customers to use in the design process. Cadence introduced a set of tools and methodology for efficiently developing and testing PDKs. “With Cadence ® Virtuoso tools, we reduced our time to release PDK to production by 50% and decreased the cost of PDK

Given that the last non-Open Access Cadence release was IC5141, which was released in 2004, had the last hotfix in November 2011 and had the final end-of-all-support date at the end of 2015, there is absolutely no good reason to create a non-Open Access PDK. It's a waste of time.