A single frame screen capture of a TV or film is normally, but not always, considered 'fair use' or 'fair dealing' under copyright law, as it is considered a small part (1/25th sec) of the over all work ('de minimus'). It is generally thought though that if you add some commentary or criticism along with your usage then you are on more solid ground, and if your usage is transformative (does not serve the same purpose as the original) then your position is even more secure.
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