What does 8396b8dd-df0a-49ad-b5ea-31cd992c0793 in the link? It can be seen that in the first and second links the structure of this code is similar:
http://cbsmedia.origin.mediaservices.windows.net/8396b8dd-df0a-49ad-b5ea-31cd992c0793/Lesson 2.ism/manifest http://cbsmedia.origin.mediaservices.windows.net/ddafddff-0580-4dcf-a64f-fad483f04cab/Lesson 13.ism/manifest 
this guid is a unique id. It is often used in different places, for example, COM libraries and classes under their unique numbers are registered in the registry of the operating system. It is guaranteed that the generated guids are always unique. Read more about these designs read for example in Wikipedia. In this case - those who posted the lessons shown in the links ('Lesson') - did not bother with the names of the folders, but used unique identifiers for this. Conspiracy and secrecy theories are not here. You ask - How are they created? - There are generators of such numbers, for example, such is built into Visual Studio. Inside it is a random number generator and probably there is time mixed there.
Source: https://ru.stackoverflow.com/questions/509047/
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