Update README.md

README.md

@@ -19,6 +19,15 @@ General documentation can be found at: [sphn-semantic-framework.readthedocs.io](
 
 The SPHN RDF schema is licensed under the [CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/) (see [License](https://git.dcc.sib.swiss/sphn-semantic-framework/sphn-ontology/-/blob/master/LICENSE)).
 
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+This material contains content from:
+* __LOINC__ (http://loinc.org). LOINC is copyright © 1995-2020, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license. LOINC® is a registered United States trademark of Regenstrief Institute, Inc.
+* __CHOP__ (https://www.bfs.admin.ch/bfs/de/home/statistiken/kataloge-datenbanken/publikationen.assetdetail.13772937.html) © BFS - 2020, Bundesamt für Statistik, Medizinische Klassifikation, Switzerland
+* __SNOMED CT__ (https://www.snomed.org/), SNOMED CT is copyright © SNOMED International 2021 v3.15.1., SNOMED CT international
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+In order to use the file please register with eHealth Suisse for an affiliate license for SNOMED CT (free) https://www.e-health-suisse.ch/technik-semantik/semantische-interoperabilitaet/snomed-ct/registration-und-lizenz.html
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 ## Contact
 
 For any question or comment, please contact the data coordination center at [dcc@sib.swiss](mailto:dcc@sib.swiss).