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. There have been 8 major Open Access-based IC releases since then (plus three advanced node variant releases). Here's a useful document on developing PDKs for OA . Regards, Andrew.
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