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The concepts and code examples might not work if you are running Umbraco 8.0 or a later version. If you are using Umbraco 7, this article is perfect for you!
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Introduction of sensitive data on the
Umbraco 7.9 and higher introduces a something called "Sensitive data" for member data. Marking fields as sensitive will hide the data in those fields for backoffice users that have no business viewing personal data of members.
If you've upgraded from a version before 7.9.0, none of the backoffice users will have access to sensitive data by default.