I see someone sells a program included youtube dl inside

[manhcuong0312]

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Question

Hi. I see a man named Ahmed Sattar written a program called Multi Extra, which included youtube dl inside, and now he sells it. Is it legal?
His facebook page, contains a status talks about this: https://www.facebook.com/ahmed.sattar.5494/
His official website contains the program: http://www.softjewel.net/
Sorry if he asked you before selling this. I post here just because I see youtube dl is free, and he getting money by your program.
Cuong

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[springbok01]

As per the ytdl license:

Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.

Which would imply that what Ahmed Sattar is doing is perfectly within the license. It does seem as if he has added other functionality, so it may not be a direct copy.