Scenario 4: Your kid sees a QR sticker on the sidewalk and takes a picture of it. This takes him to a goatse site, which scars him for life.
I think these present more a risk than conveniences. It is to me as if all our email and snail mail came enclosed in white envelopes so that we won't know what's in them until we open them. Bad idea! In a like manner, QR codes allow for the posting of nasty and even illegal things in everybody's faces, but you won't be able to tell unless you decode it.
Don't get me wrong. I think the idea has a lot of potential. But it's like when email was created. Back in those days they thought "surely nobody would send an email saying they are somebody they are not" and so email was created from the start to be a trusting system. Look where we're at now and the millions and millions of dollars we spend trying to make sure we only get email from legitimate sources.
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