Public and private data in one code
An SQRC looks like an ordinary QR code, but it can carry two kinds of data. The public part is readable by any standard QR scanner. The private part is encrypted and can only be read by a scanner configured with the matching key.
This lets a single printed code serve two audiences. A customer might see a product page or a reference number, while an authorized handheld reader in a warehouse also sees internal details that were never visible to the public.
Typical uses and limits
SQRC is used where a code must travel on public items but hold information that should stay internal, such as ID cards, internal tracking, or documents with personal details. Reading the private section requires compatible readers and key management from the vendor.
Encryption protects the hidden data from being read, but it does not stop someone from photocopying the whole code. If copying is a concern, the reader or back-end system needs its own checks.