Which barcode format is used on tickets?

Stage includes a Code128 barcode on each generated ticket's PDF. The following is an example of the barcode included:

serial_barcode.png

Such barcodes are used worldwide in multiple sectors including packaging and transport industries. The Code 128 is supported by most barcode readers on the market, so these devices can be easily used to control access to any event run with Stage.

More on Code128 in the wikipedia.