Thursday, December 17, 2009
YouTube FLV files contain unique identifiers which could be used to find who downloaded a particular file
FLV files which have been downloaded from YouTube have a unique identifier. In several files I examined, the string "sourcedata" occurs at offset 0x10E and a unique alphanumeric ID is at offsets 0x11B through 0x125. Presumably, these unique identifiers can be matched with information in YouTube logs in order to find the IP or user who downloaded the file.