---
title: Third-party libraries license - iOS (classic)
description: Contentsquare iOS SDK includes several third-party libraries, which are licensed under their own respective licenses
lastUpdated: 16 March 2026
source_url:
  html: https://docs.contentsquare.com/en/ios/third-party-libraries-license/
  md: https://docs.contentsquare.com/en/ios/third-party-libraries-license/index.md
---

> Documentation index: https://docs.contentsquare.com/llms.txt
> Use this file to discover all available pages before exploring further.

The latest CSQ SDK is here! Learn how to [upgrade your app](https://docs.contentsquare.com/en/csq-sdk-ios/experience-analytics/upgrade-from-cs-sdk/).

The iOS SDK includes third-party libraries; the tables below list each library, its license, and copyright notice.

## Core SDK

| Libraries | License | Copyright |
| - | - | - |
| SwiftProtobuf | Apache-2.0 license | Copyright (c) 2014 - 2017 Apple Inc. and the project authors |

## Error Analysis SDK

| Libraries | License | Copyright |
| - | - | - |
| PLCrashReporter | MIT | Copyright (c) Microsoft Corporation. and the project authors |