As you say, that refers to printed copies, photocopies etc. That isn't what the article is suggesting.

He's talking about sending DIGITAL copies.

That and you will need a copy machine that actually copies bills. Some machines use software to block it.

(see http://en.wikipedia.org/wiki/EURion_constellation)

Help yourself to a dollar:

http://imgur.com/uFJht

You sure you can afford this? I wouldn't want to impose.

It's a privilege to sacrifice for a good cause.

wow...a xerox machine that has a built-in database of images to "do not reprint", WOW!!!

It's not so much a database as a pattern: https://en.wikipedia.org/wiki/EURion_constellation

Yeah, this is one of those things like joking around in the airport security line where it just isn't worth doing.