How and when to obtain permission from a work's copyright holder to use that work in your own project or course.
The Introductory audio was created by Setuniman and retrieved from
[ Ссылка ]
[ Ссылка ]
We used the first 3 seconds.
The remaining audio was created by A. A. Aalto and retrieved from [ Ссылка ]
[ Ссылка ]
