Let's grasp the history of DDC and EDID

At first, DDC v1.0 was announced in Aug12, 1994.
DDC defines a communication channel between a display and a host system.

Next, EDID v1.1 was announced in Apr9, 1996.
EDID is 128 bytes of encoded data stored in a display or other interface device.
It can contain extension blocks of 128 bytes or more.
EDID is the basis for “Plug & Play” for all Display/Graphics sub-systems.

After that, DDC went to E-DDC to support E-EDID.
E-DDC v1.1 was announced in Mar24, 2004.
E-EDID v1.4 was announced in Sep25, 2006.

There are the other VESA Standards Relevant to EDID as follows.
CVT & DMT - Timing
DPM - Display Power Management
Extension Blocks - Extra EDID information
DDC/CI - Display Data Channel Command Interface
DPVL - Digital Packet Video Link
MCCS - Monitor Control Command Set
MDDI - Mobile Display Interface Standard

reference:
http://www.x.org/wiki/Events/XDC2007/Notes/Xorg_2007-EDID-JMiseli.pdf
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