write data on any surface ??? hi i was in a meeting where a man presented a system ( called Promotron ) for write data "on any surface" in an "invisible" , "in-adulterable", "impossible to copy" way and then read it......... he never showed, by the way, HOW HE WRITES THE DATA and he said that the way of writing is a secret is it possible ??? his intention is to replace clasics magnetic stripe cards by any object ( plastic card, cardboard, etc ) using this system he said that this is a revolutionary technology...... but i don't rely much in him i have looked for some system already invented, and i found "LSA - laser surface autenthication" by russell cowburn LSA method simply don't write , just unique surface properties i think the system that i seen is a like of copy of LSA what do you think can anybody guide me to "the truth" ?