wow specs that are free.. in the wireless world a lot of specs are free, as I just googled. however later that day I worked with NXP NTAG's 213-216 and tried to figure out more specifications especially about NDEF and they were put behind big paywalls. very very sad (http://nfc-forum.org/our-work/specifications-and-application...) I always wonder how to push such technologies, if you can't implement it without paying. it's just akward.