1. The upload should use less than 50% of the original copyrighted work
2. The upload must use the copyrighted work in combination with other content
3. The use should be 'minor'
The term 'minor' applies to non-commercial uses of fewer than 15 seconds of video or audio, 160 characters of text, or 125 kB of graphics. If the use of a copyrighted work exceeds these 'minor' thresholds, it can still qualify as 'presumably authorized' when the uploader flags it as an exception.
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