Xiaoming downloaded a genuine movie from the Internet, and his friend copied the movie to his computer with a mobile hard disk. Are their actions illegal? why

Illegal. If it hadn't been downloaded by 1 person, the film company would have closed down long ago. Many people in China are too immoral to admit that they have done something illegal.

There are also genuine movies that have been verified. Only your computer can watch them, but other computers can't open them.

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Supplement:

Don't trust others, just trust me. Chinese mainland people think that piracy is normal. This is illegal. We use piracy, but we should realize that what we do is illegal and stop making excuses for ourselves.

Computer information and clothes are two different things. There is copyright and knowledge protection here.