1. Only1st & 2nd layer codes are unique from book to book
2. Thecontent QR code for each particular session (a page/ chapter/ question/paragraph/ etc.) will be the same from book to book of the same SKU.
This approach incurs LOWER cost:
- Fewer unique QR codes to begenerated
- Only the cover page requires digital printing while internal pages may use traditional printing technologies(eg. offset)