ISO Standard 15740:2005
While this is again not a camera, this describes how to access most of the
current ones.
And it is as expensive as a small camera (around 120 Euro).
I have also bought the v1.1 version (2008 edition), also 120 Euro.
- Printed on paper.
- Uses watermark with my name in it.
- Describes how 'PTP' works, with addendum on USB implementation.