system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Before the invention of the barcode, how did concerts and other events prevent scammers from simply printing out lookalike tickets and getting in for free?
gpt
They did not have to.

The barcode was invented in the 50s and had its first commercial use in 1974.


High quality printers didn't really enter the home until the mid 90s.

There really isn't a period of time where the barcode wasn't in use but people had access to printers they could use freely.

There is also the burden of sourcing the correct card stock by weight and color.