It is possible for people to actually read these by matching up each block and decoding their meaning via their position in the scheme. It does seem quite possible, but I fail to understand why people would even want to do so except to figure out why it works. It would definitely take a long time to do so. There is plenty for free, open source software that will read or print these codes.
Zbar is one open source program that can read QR-codes as well as many others.
Zint is a program that will save data as a bar-code via a .png file.
You can read more about how QR codes work by visiting here (Wikipedia).
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