Somebody corrupted my QR Code.
Can you tell me who did this and when it happened?
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My guess: Gabriel Syme corrupted your QR Code on Thursday.
Taking Sleafars work on the DataMatrix, we get the first hint: G SYME
I play around some time with the QR Code, trying various approaches (e.g: subtracting the DataMatrix from the QR Code).
Eventually I managed to decode the corrupted QR Code to the following Strings: "The Man W} W~nThuúªay", "The Man Wh7 Wlq ThtÌÌÌay".
-> The Man ??????? Thursday
Some search on the internet led to the novel "The Man Who Was Thursday" by G. K. Chesterton where the main character is an undercover detective called Gabriel Syme
If we look at the link provided by the OP, we can see examples for 2 different barcode types: GS1 DataMatrix and GS1 QR Code.
The barcode in the puzzle looks like a QR code ("concentric" squares in 3 corners), but it can't be decoded. However, if we look more closely, we can see a DataMatrix code in the centre (2 black borders, 2 borders with alternating black/white dots):
This one can be decoded to the string G SYME.
My best guess is, that G. Syme corrupted the barcode in 1949 (based in the info in the link).
Note: There are more areas in the bottom which look like they could work as DataMatrix codes, but I wasn't able to decode them.