I'm planning to impliment QR Codes with my online brand, through my website and buisness cards. I have no idea how to code / program the codes to have some sort of security so any hacker can't just change the info on the codes. Im also interested in putting custom designs inside my codes. Are there any QR Code pro's out there who will lend a helping hand and pass out some knowlege / books I can read? I'm on GOODREADS trying to find books that will teach me what I want to know about QR Codes with no luck.