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The honor system, mostly. The same could be said for price tags, bar codes, license plates, etc...
by wmeredith 13y ago
The honor system, mostly. The same could be said for price tags, bar codes, license plates, etc...
- mbesto 13y agoBut those all have specific use cases. QR codes on the other hand are meant to be universal. Imagine the QR codes in a museum all replaced with links to porn sites (two different uses - one is for information and another is for advertising).