> For the complete documentation index, see [llms.txt](https://gl-docs.gitbook.io/zkpass/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://gl-docs.gitbook.io/zkpass/zkpass-developers-guide/zkpass-modules/dvr/dvr-client-roles.md).

# DVR Client Roles

Depending on the application, the client of DVR can take one of these roles:

1. <mark style="color:orange;">**Data Issuer**</mark>\
   The entity responsible for issuing the original data that requires protection.
2. <mark style="color:orange;">**Data Holder (User)**</mark>\
   The individual whose confidential data is being protected.
3. <mark style="color:orange;">**Proof Verifier**</mark>\
   The service or application that sets the requirements or conditions on the user data. It verifies the zero-knowledge proof, which contains the result of the requirements.

This multi-faceted trust model allows the proper flow of data and communications among the DVR stakeholder clients and ensures that the user’s confidential information remains protected and secure.