Quote from jasonbuechler :I can't believe no one's pointed this out yet. I printed two coupons within a few second of each other from two different browsers and the bar codes are identical.
But more than that, they are obviously a part of the background image, as suggested by the fact they are scaled and dithered equally with the rest of the page, excepting "This coupon is for XYZ" and the supposed serial number. The catch is that bar codes cannot be dithered: gray scales and smeared bars invalidate them (or at best, give incorrect values).
My two serial numbers also seem to have zero relationship to each other, and given the fact the bar codes are a sham, this probably means the serial numbers are randomly generated. The moral of this story: if you know how to capture your print jobs, and you are paranoid, just edit the image with new info. If you are not paranoid, just xerox as many as you want.
Quote from dishguy05 :for all you multi-loaders, you do NOT have to generate mcDonalds coupons multiple times, barcodes don't mean jack to them. you can just get 1 coupon, paste it multiple times if you're saving paper or print the same one multiple times.
mcdonalds registers have a 'coupon' button, they just click that and apply the coupon you brought over. i found out on a $1 off coupon, i just printed the same coupon 4 times on one page and it worked all the time.
so, in theory someone can just get the coupon and attach it to the wiki, and you're good to go
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