For a general overview of the context of e-signature governance, see Policy Frameworks.
A small set of representative e-signature regulation examples follow.Prescriptive PKI jurisdictions
India: Information Technology Act - 2000
Note that Indian PKI laws prohibit chaining to offshore root CAs.
Malaysia: Digital Signatures Act - 1997
Two Tier PKI Jurisdictions and Regulators
Hong Kong's Office for the Recognition of CAs