The following information may be out of date, since I discontinued my
subscription about a year ago.
Xpress includes a large amount of encrypted information in their
data stream that cannot be decoded by the standard Xpress demodulators.
Each decryption unit that they sell has a unique id.
Periodically they transmit an "enable" command addressed to each
of the decoders which are subscribed to their "Executive Service".
The unencoded stock quotes only include the "most popular" stocks.
The encoded stock information includes all of the stocks traded
on every US stock exchange. They also encrypt several business oriented
news services. I don't recall which ones are available. You can find
out by calling them.
I hope this helps.
s.