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YouTube's next move might make it virtually impossible to block ads
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
There's already addons that can recognize in-video sponsored content and skip, if youtube splices in ads into the video stream these addons will still work (although depending on how strict server side logic is, they may have to pause when the buffer runs out until the time of the ad length has passed)
It doesn't recognize the sponsor sections. The community does that. I don't believe there is any tool right now that can automatically detect the sponsor sections.