Wow this is an interesting topic! After some investigation here, we've found that some Canon printers sold in the USA do disable direct CD printing. In terms of why they do this, from what I've read, they do it due to patent issues with Epson. If anyone in our 'Forum Community' wants to chime in, we would appreciate your input.
If the printer is sold in the USA, I would think that the seller would state whether or not the printer has the capability to print directly to the CD, DVD, and Blu-ray.
After a little research on the Canon USA website they list the following models of printers that support printing directly to CD, DVD, and Blu-ray:
There may be even more that allow this function.
Hope that helps!