Richard Byrne writes: “Clipping a section of a video that you’ve already uploaded to your YouTube account can be a convenient way to remedy a small problem that you didn’t notice when you initially uploaded it. For example, after uploading you might notice that you forgot to cut out a section of downtime or transition between scenes (like stage change-overs at school music recitals). You might also use the clipping function to remove the appearance of people who don’t want to appear in a published video.”