Parameter "...? Ecver = x ..." youtube embed urls

I noticed that when embedding a Youtube video, the following 2 URLs achieve the same result:

https://www.youtube.com/embed/ML1AyQC2HKM?ecver=2&modestbranding=1&rel=0
https://www.youtube.com/embed/kwdRYaBUco4?modestbranding=1&rel=0

youtube embedded video with a set of parameters

What does the parameter do ecverin the youtube embed url?

After checking the Documentation and searching the Internet, I could not find anything to explain this parameter.

Would the title suggest its installation of a version of the Excript? but this is just a blow in the dark, and I cannot find anything to confirm this.

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ecver = 1 . , + , + .

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Source: https://habr.com/ru/post/1017104/


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