> For the complete documentation index, see [llms.txt](https://docs.kouncil.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kouncil.io/getting-started/features/data_masking.md).
# Data masking
Some of the messages in topics might contain personal and sensitive data. To secure this kind of information we added new feature, data masking.
To turn on this feature, you will have to modify user groups permissions as shown on the screen below:
In that case users with `admin_group` will have access to view, create, modify and remove data masking policies.
## List of policies
To view list of all defined policies you should pick **Data masking policies** from the menu.
## Add new policy
To create new policy you will have to click Add new policy button on the policies list screen. Then you will see create new policy form.
In that form you will have to provide:
* name - policy name
* fields - list of fields names and masking type for each of them
* resources - clusters and topics
* list of selected clusters and topics names (as topic names you can provide any valid regex) for which policy will be applied
* or, if you want, you can apply policy to all resources by ticking the checkbox below resources label
* user groups - list of user groups for which policy will be applied
## Applying policy
Policies will be applied automatically. When you log in as a user with user group defined in the policy, topic messages for selected resource will have masked data. For masking, star sign, `*`, will be used.
If we follow above defined policy you should not be able to see all information in CustomerTopic.
## Remove policy
Of course if you no longer need the policy you can remove it. To do it, navigate to policies list and click **Delete** button in the row of the policy you want to remove.