RUN Java Applet?

I am using one of those sites that allow you to download YouTube videos the websites is the best but I am a bit considered as it's the only one that has this: A Java Applet window pops up and I have to press RUN to be able to begin download. My question what are the the risks.

It also says this:

Quote:To continue, please click 'Run' when prompted.
Tick the box 'Always trust content from this publisher' to download seamlessly in the future.

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Only run known Java Applets the otherwise you can be hacked! Most the websites that engage in video download are not to be trusted.

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I don't recommend it. However if you trust the site then power to you.

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you are easily run to command through.

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