[Fyron]

Atrocities said:
Your printer prints all information about itself, and your PC on each and every peace of paper printed.

bull. Your printer can print a diagnostic sheet with some info about itself, sure. But that is purely for your use in trouble-shooting. No consumer-level printer can possibly print secret information on every page, either with some sort of "invisible ink" or at tiny, tiny resolution such that you can't see it with the unaided eye. That would require massive engineering costs, making them impossible to sell in the low hundreds of dollars range.

The META data in Digital images gives all information about the camera and its settings at the time the image was taken.

Yes, it's called EXIF data. There is nothing unusual or scary about that, in any way. It is there to provide you, the photographer, with extra information about your photos. The entire process was designed and implemented openly, at consumer (mostly professional level, but still consumers) request. Maybe you should look up just what EXIF data is...

Your CD burner burns its serial number, and your PC information onto each disk you create.

I'd have to call bull again. MAYBE a drive serial number, but even that is unlikely. If drive manufacturers were to attempt this (or be forced by the government), there would be privacy related lawsuits about it. The ALCU, for one, would be all over it.