I've found reference to this on Wikipedia, starting from the section linked it describes two items that are placed on a disk:
Recorder Identification Code (RID)
Consists of a supplier code, a model number and the unique ID of the recorder.
This seems to be burnt on to the disk when it is written, and identifies the drive used - this is the code your quote is talking about.
However, I have been unable to find any specific details of implimentation...
Source Identification Code (SID):
Is an eight character code that is placed on every CD-ROM. The SID identifies not only manufacturer, the individual factory, and even the machine that produced the disc.
Quoting Philips: "The Source IDentification Code (SID Code) provides an optical disc production facility with the means to identify:
- all discs mastered and/or replicated in its plant;
- and the individual Laser Beam Recorder (LBR) signal processor or mould that produced a particular stamper or disc
Specifically, it looks like the SID code is stamped on when the disk is originally made, and not when you write the disk.
I managed to find a PDF file from Phillips, describing how manufacturers of CD should implement the SID code. From this we can see that the SID code are the numbers printed on the inner ring of the CD in the non-data area.
The SID code is therefore useful to identify fake or counterfeit products (but probably only to the authorities), because they will likely have the wrong SID code (the disks having been produced in a different factory to the real product).
Here is an example image of SID on a disk that I've found on the web: