...
"IHTSDO and its Members propose to stop issuing (directly or indirectly) licenses for the use of antecedent versions including SNOP, SNOMED, SNOMED II, SNOMED International (3.x), and SNOMED RT as of April 26th 2017 except for research purposes and to enable the interpretation of historical data captured using antecedent versions." (source)
This statement text states the position of SNOMED International as of 26 April 2017. Therefore SNOMED International cannot support including a URI in our specification to accommodate continued use of unlicensed, antecedent versions of SNOMED CT. Those who choose to send legacy SNOMED data have an obligation to provide a link to the appropriate SNOMED CT concept using the simple map provided by SNOMED International.
...