The System (Well-Known) Ports are those from 0 through 1023. (See http://www.iana.org/assignments/port-numbers.)

In order to obtain a system port number you need to have a specification documented in the form of an RFC, an Internet-Draft that is intended to be published as an RFC, or a permanently and readily available reference that the IETF could standardize if it chose to.

For more information about Internet-Drafts, please see the following:
http://www.ietf.org/ID.html
http://www.ietf.org/ID-nits.html

For more information about RFCs, please see the following:
www.rfc-editor.org

Please note that a particular application or service should be able to operate only one well-known assigned system port. For applications or services that offer multiple functions it is usually possible to use one port as a multiplexer or rendezvous service. That is, the client always initiates the use of a service by contacting the rendezvous port and indicating in its first message which function is needed. The rendezvous service then either (A) creates (forks, spawns) a process to perform that function and passes the connection to it; or (B) dynamically selects a (high-numbered) port and starts a process to perform the function listening on that port and sends a message back to the client telling it to call the new process on that port.

There is no opportunity for Non-disclosure agreements for System (Well-Known) port numbers.

If you are unable to provide the above requested information and you would like to apply for a user port number, please see the following for an application:
http://www.iana.org/cgi-bin/usr-port-number.pl