{HEAD ~ The method} 1, further comprising {TAIL ~ the step} of authenticating one or more of said marked items, by verifying that a decrypted unique reference identical to a generated unique reference can be derived by decrypting a unique code on a marked item with said unique key 
comprising
{ HEAD ~ The method } 1 , further comprising { TAIL ~ the step } of authenticating one or more of said marked items , by verifying that a decrypted unique reference identical to a generated unique reference can be derived by decrypting a unique code on a marked item with said unique key
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH