Techniques are provided for utilizing time-stamps and digital signatures to be sent with the messages communicated between partners of a trading community. A Latent Semantic Indexing index can be created from the plurality of documents. The passages are provided with a peripheral perimeter, which is made of a different material than the material of the implant surrounding the perimeter. The method also employs the addition of air into a hydrogen feed loop that through oxidation within the apparatus consumes the hydrogen. The measured phase difference is communicated to the receiver and used therein to generate a copy .