Although the title says YouTube videos, this post discusses any other similar video sharing sites. The technology that YouTube and other sites use may be something like this:
Although it is possible to do so, sites like YouTube don't really want visitors to be able to download the actual FLVs. However many programs and hacks have been developed that get over this limitation.
There's also another aspect to this download issue: plainly, you may be breaking copyright rules if you download content that belongs to someone else.
And there's yet another thought, that of the video quality. Most of the content on YouTube is compressed so that the videos can play well over all types of Internet connections. Sometimes, you can request the original owner of the video for a higher quality copy. This approach also allows you to request their permission to use the video clip.
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