How do youtube videos get removed and have sound taken off?

I just want to know HOW and WHY youtube videos get removed. Like they'll say either: this video has been removed due to terms of violation, or youtube will delete the sound of the video. How does this happen??? I don't get what they mean when they say that you have property not recognized by wmg, or something like that, or why they remove your video due to terms of violation. Does it get removed right away or at any random time?

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They remove the audio of the video because the sound on it is copyright,
If I put a song on THAT I DIDNT OWN It's not mine is it? it's the record company that made it. To stop youtube being sewed they remove the sound.
You're probly thinking how is this true there is music videos on there, Some are allowed because of copyright permissions by the owner and some are official.

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YouTube don't often remove the video unless it's been flagged by users, videos are removed for things such as this.
YouTube analyse all of the flags that have been sent in, if they agree with the flag sent in the appropriate action will be taken against the video.
YouTube have ways of detecting music on videos and also remove the audio/video in an appropriate way.

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Everything is done for a good reason you'll understand if you were youtube.
Hope this helps, please vote best answer if it did.
Hey everyone I need to know how(if I even can) put youtube vids in Myspace picture comments without a link. In other words just the vid is playable right beneath the picture being commented on in the comment box. I saw this once on a pic. Does myspace still support it? Thanks in advance for any help you can provide. :)
i think the embedded html is too long for the limited myspace comment.