One of the central claims in open-source licenses is to retain the copyright. Many proprietary software uses open-source projects, libraries, or packages.

For licenses like MIT, and BSD, copyright included in license text

Visual Studio Code license copyright

For licenses like Apache 2.0, copyrights are included in a file named NOTICE, which you can find in the root directory of the source code.

Prometheus NOTICE file

For Example, in license text, MIT license contains the following instructions "The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software."

Apache 2.0 license text contains the following requirement
"You must retain, in the Source form of any Derivative Works that You distribute, all copyright, patent, trademark, and attribution notices from the Source form of the Work, excluding those notices that do not pertain to any part of the Derivative Works;"

GoPro

GoPro for action cameras has a dedicated page where you can download archives which are open sources that are used in related camera models.

List of open-source projects and packages with licenses

Mercedes-Benz

Mercedes-Benz AG uses Free and Open Source software in their Vehicles. To check which software is used in your vehicle, you need to paste the related VIN on this site

As a result, you can download the pdf file with information related to the vehicle model.

Santander

The Mobile app has a separate menu item, "License", that contains license text with related copyrights notice.

License menu item

License text and copyright

Cisco

Cisco AnyConnect Desktop client contains license copyright information related OpenSSL Toolkit and libcurl HTTP library

AnyConnect dialog window

Share your findings on how the companies you know retain open-source licenses and copyrights in the comments.