Obviously, stealing videos from YouTube is a big no-no. There's a reason YouTube runs ads: People make a living this way.

Watching YouTube videos offline through unofficial channels takes money from Google and video creators. It's more black and white when you consider Google's terms of service for YouTube (Opens in a new window), which read: 'You are not allowed to.access, reproduce, download, distribute, transmit, broadcast, display, sell, license, alter, modify or otherwise use any part of the Service or any Content except: (a) as expressly authorized by the Service or (b) with prior written permission from YouTube and, if applicable, the respective rights holders.' On the copyright front, as long as you're downloading a video for your own personal offline use, you're probably okay. But when the topic of downloading YouTube videos comes up, there's a side subject that must be broached: Is it legal? That said, sometimes you really want or need to have one of those videos on your own computer or phone. And that's hardly the most astounding statistic about the site, which has been the go-to destination for uploading and watching videos online since 2005. There are billions of hours of video on YouTube, literally.

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