> For the complete documentation index, see [llms.txt](https://documentation.immuta.com/saas/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://documentation.immuta.com/saas/govern/secure-your-data/authoring-policies-in-secure/data-policies/how-to-guides/manage-policies-per-data-source.md).

# Policy Certifications and Diffs

Create certifications for global policies, certify a policy, and view changes made to a data source's policy

## Create a custom certification for a global policy

Data governors can add certifications that outline acknowledgements or [require approvals from data owners](#certify-global-policies). For example, data governors could add a custom certification that states that data owners must verify that tags have been added correctly to their data sources before certifying the policy.

1. Click **Add Certification** in the data policy builder.
2. Enter a **Certification Label** and **Certification Text** in the corresponding fields of the dialog that appears.
3. Click **Save**.

## Certify global policies

After a policy with a certification requirement is applied to a data source, data owners will receive a notification indicating that they need to certify the policy.

1. Navigate to the **Policies** tab of the affected data source, and review the policy in the **Data Policies** section.
2. Click **Certify Policy**.
3. In the **Policy Certification** modal, click **Sign and Certify**.

## View policy diffs

Once you have a data policy in effect, you can view the changes in your policies by clicking the **Policy Diff** button in the data policies section on a data source's policies tab.

The **Policy Diff** button displays previous policies and the current policy applied to the data source.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.

Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:

```
GET https://documentation.immuta.com/saas/govern/secure-your-data/authoring-policies-in-secure/data-policies/how-to-guides/manage-policies-per-data-source.md?ask=<question>&goal=<user_goal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.