safe way to download videos from youtube and other websites

what are the safe software or websites that we can download videos from youtube or from other websites?
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Use Internet Download manager (not free). >
Brad GrouxSenior Manager (Wintel Engineering)Commented: to download the full movies and videos. to download just the audio.

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Clipgrab is a free downloader for YouTube and other sites:
Rob HutchinsonDesktop SupportCommented:
All you need to do is freeze your PC when you are watching vid's the unfreeze it when you are done, then it won't matter what website you view.
Safest sites, Google video just type in the subject/   Vimeo /  Youtube Movies   /free full movies on Youtube
With so many choices there's really no need to download, But if they have no copyrights, you can download them using as suggested KeepVid or youtube landowner pro. It's faster than the free version and gives you the choices of converting them, queuing them /downloading the audio only out of the video. It is 29 dollars a year recurring.
A lot of sites won't allow you to download them.
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