1st question- How to read the data that is stored in a non-changeable tag? I mean not only the UID but also the 16 bits or bytes (not sure) of something written. Note: I only have to READ, not WRITE over it.
2nd question- After I've successfully completed #1 step, how to write the "something written" to the new tag (this should result in cloning the secret data of "something" :D) ?
3rd question- Actually, how do the locks-with-tags on storey buildings work? Do they read the UID or the secret data?