> 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/glossary/user-data.md).

# User Data

In the DVR model, this data is owned by the Data Holder (the user) but provisioned by an entity known as the Data Issuer.

Notably, the DVR and zkPass framework accommodates a high degree of data schematization flexibility. It is engineered to be agnostic to any particular data schema, seamlessly interfacing with JSON objects or any other structured format specified by the Data Issuer. The eventual consumer of the data user is the DVR app running on the zkPass Service.

For a complete definition of the user data, please follow this [link](/zkpass/zkpass-developers-guide/zkpass-modules/dvr/key-concepts/user-data.md).