Board Thread:Wiki Discussion/@comment-5235303-20130411095021/@comment-5235303-20130418203313

Uploaded by author means the producer has uploaded the video on his/her own personal YouTube channel. (example: 40meterP, Hitoshizuku-P, cosMo@Bousou-P)

Official upload means that someone other than the producer has uploaded the video on YouTube but it's still, y'know, official. (example: IAPROJECT uploads videos for Jin and Ishifuro; crownrecord (record label) uploads videos for Yuuyu)