# Document history
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The following table describes significant changes to this guide. 


| 
| 
| Change | Description | Date | 
| --- |--- |--- |
| Added details and examples for Amazon Verified Permissions | Added detailed discussions, examples, and code for using Amazon Verified Permissions to implement a PDP. New sections include:+ [Implementing a PDP by using Amazon Verified Permissions](avp.md)<br />+ [Design models for Amazon Verified Permissions](using-avp.md)<br />+ [Amazon Verified Permissions multi-tenant design considerations](avp-design-considerations.md)<br />+ [Retrieving external data for a PDP in Amazon Verified Permissions](external-data-avp.md) | May 28, 2024 | 
| Clarified information | Clarified the distributed PDP with PEPs on APIs design model. | January 10, 2024 | 
| Added brief information about new AWS service | Added information about [Amazon Verified Permissions](https://aws.amazon.com/verified-permissions/), which provides the same functionality and benefits as OPA. | May 22, 2023 | 
| Initial publication | — | August 17, 2021 |