# Reference Guides

- [Subscription Policies Reference Guide](https://documentation.immuta.com/saas/govern/secure-your-data/authoring-policies-in-secure/section-contents/reference-guides/subscription-policies.md): Learn how grant and guardrail subscription policies protect and grant access to data
- [Subscription Policy Access Types](https://documentation.immuta.com/saas/govern/secure-your-data/authoring-policies-in-secure/section-contents/reference-guides/subscription-access-types.md): Learn what data platforms support read and write access subscription policies
- [Advanced DSL Policy Builder Functions and Variables](https://documentation.immuta.com/saas/govern/secure-your-data/authoring-policies-in-secure/section-contents/reference-guides/advanced-special-functions.md): Learn about the definitions and behavior of the variables and functions supported in the advanced DSL policy builder


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