A chord progression is just what it sounds like: a selection of chords arranged in a specific order. Popular music tends to draw from a very small pool of commonly-used chords, and the permutations that result in a progression that is musically meaningful and pleasing to the ear is correspondingly small.
It should be borne in mind that the outcome of a copyright lawsuit favors the side that makes the better argument, and not necessarily what musical analysis reveals.
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