Encrypted video files
All the video files are stored encrypted as per TfL spec, and it's normal for such systems to store lots of small files in case of power failure (drivers regularly power cycle the buses to remove fault warnings).
Although much of the CCTV retrieval is now done over WiFi when the bus gets to the garage, in 2016 most retrieval would involve physically removing the hard drive and replacing with another. When the files are pulled from the drive by the CCTV/accident person, the hard drive just gets put aside until it gets swapped with another when CCTV from another bus is requested. I would expect these are just video files and log files with the wrong key and are therefore unreadable or "illegal" in the context of that individual bus.
Biting the hand that feeds IT
