J'ai trouve MediaInfo, et ca me dit :
General
CompleteName : E:\Gilles\My Videos\PulzzVAD\download\30474c29af3423b8b07f79ce268518b3\#355b982fe6ba190107e7f2db10840a40\076bbe73fcd36dc62b0eac7ca99cc276.mp4
Format : MPEG-4
Format_Profile : Base Media / Version 2
CodecID : mp42
FileSize/String : 1.27 GiB
Duration/String : 1h 50mn
OverallBitRate_Mode/String : Variable
OverallBitRate/String : 1 645 Kbps
Encoded_Date : UTC 2012-09-13 16:15:52
Tagged_Date : UTC 2012-09-13 17:21:07
Video
ID/String : 1
Format : AVC
Format/Info : Advanced Video Codec
Format_Profile : Main@L4.0
Format_Settings_CABAC/String : Yes
Format_Settings_RefFrames/String : 4 frames
CodecID : encv / avc1 / mp4a
Duration/String : 1h 50mn
BitRate_Mode/String : Constant
BitRate/String : 1 500 Kbps
Width/String : 832 pixels
Height/String : 468 pixels
DisplayAspectRatio/String : 16:9
FrameRate_Mode/String : Constant
FrameRate/String : 25.000 fps
ColorSpace : YUV
ChromaSubsampling : 4:2:0
BitDepth/String : 8 bits
ScanType/String : Progressive
Bits-(Pixel*Frame) : 0.154
StreamSize/String : 1.16 GiB (92%)
Language/String : English
Encoded_Date : UTC 2012-09-13 16:15:52
Tagged_Date : UTC 2012-09-13 17:21:07
Encryption : Encrypted
Audio
ID/String : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format_Profile : LC
CodecID : 40
Duration/String : 1h 50mn
BitRate_Mode/String : Variable
BitRate/String : 135 Kbps
BitRate_Nominal/String : 125 Kbps
BitRate_Maximum/String : 155 Kbps
Channel(s)/String : 2 channels
ChannelPositions : Front: L R
SamplingRate/String : 48.0 KHz
Compression_Mode/String : Lossy
StreamSize/String : 107 MiB (8%)
Language/String : 210
Encoded_Date : UTC 2012-09-13 16:15:52
Tagged_Date : UTC 2012-09-13 17:21:07
Encryption : Encrypted
Donc... Encrypted.
Mais sans plus de details...