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OK, first: Thanks for the ideas and comments! 
We are running a little bit in circles. Sure, a LMS provides Scenario 1.
And sure, ...
There's no way to do that in Captivate natively
means: There is no function in Captivate itself now for this. Right.
But I'm not sure that there is absolutely no way to solve this for now. Have some rough ideas in mind, but am not able to program it for myself.
by server slide programming
should be indeed the solution. My own try had gone in this direction and had failed till now. Perhaps I only do not understand the acces to the captivate variables and/or the JSON-Thing, that's why I asked for help. For me it feels that I - or we - are not far from somewhat working.
So: Is there anybody who can write a javascript-code that ...
1 sets own Captivate Variabe "known_user" to "no"
2 sets own Captivate Variable "LicCounter" to "0" (numeric)
3 Post the value of cpQuizInfoStudentName to a PHP-File on a different server. Lets say https://exampleserver.org/checklicence.php
4 ... and wait for responseText from the PHP with 2 values separated with "|"
[PHP-Procedere is clear and working or at least known as working]
5 switch to Captivate screen, let's say "010 - False 1 (no connection)" after 15 Seconds with no response
6 Set Variabe "known_user" to the value of the first data-part of responseText
7 Set Variable "LicCounter" to the value of the second data-part of responseText
6 switch to next Captivate screen, let's say "002 Feedback licence check"
... wich will be placed on a button in the first ("001") screen?
Here the user will be informed that it will be checked on a different server if he can proceed before.
From screen "002 Feedback licence check" I would inform ("You are a known User, proceed", "you are not a known user and there are no licences for new users left", "You are a new user and there are $$LicCounter$$ Lincences left. Please proceed") and show buttons wich lead to appropriate Screens.
If a get a working sample of the numbered java-script code I will try standalone HTML5 and a SCORM-LMS-Import and inform if the problem can be solved in this way. So we all know more after it.
If someone know for sure that this thing can no way work: OK, that would be an anwser too.
Nethertheless: Other ideas bejond a server-side-solution as outlined are still welcome. We do not know if such a script that sets captivate-variables from a far server is possible and perhaps we also have overlook a far easier solution.
Thanks Jim. It is already used in a constellation you describe as "more secure". But in this case an already available LMS of a customer can not be used.
The unsolved question is if it is possible to give away SCORM or HTML5 - Files for use in an enviroment wich you are not able to control with any - if not perfect - limitation on it. You think it should work in a not-really-secure way wich I outlined. OK, so I will again "fight"* with the code and try to make it work ...
* I'm no real programmer, that's why I use authoring tools 
OK, on the same server it works now. Downward the code on the button described above for everyone who is interested.
http://example.de/example.php sends back "teststudendname|8" - just for a test for future handle names and counters - wich is indeed showed in the HTML5-Export when it's on the same server.
countid is the ID of the individual Test-Export for one customer. Send to the php for the database
cpQuizInfoStudentName is the captivate/SCORM-Variable for the User-Name. If there are licences left or the user is known in the database (to come) as used the app before it will be the same as transmitted to the php, else it will be "no licence" e.g. given back from the php in his 1st data.
lizenzok will be the number on licences left or just a boolean transmittet by the php in his 2nd data.
It goes on slow - because of lack of knownledge and time of mine, but it goes on! And it goes better with the feedback signals in this forum than with someone I wanted to pay for a solution who said "no problem!" ... and never heard again. 
More (for a different server) when I made it working.
Help to force this outcome or hints to "bad ideas" in the code below still gladly accepted!
//check if window.cpAPIInterface is available
if(window.cpAPIInterface)
{
//check if window.cpAPIEventEmitter is available
if(window.cpAPIEventEmitter)
{
//add a listener to CPAPI_INTERACTIVEITEMSUBMIT event
window.cpAPIEventEmitter.addEventListener("CPAPI_INTERACTIVEITEMSUBMIT",function(e)
{
// Eigentliche Funktion ANFANG
function createReqObj() {
brws = navigator.appName;
if(brws == "Microsoft Internet Explorer"){
rq = new ActiveXObject("Microsoft.XMLHTTP");
} else {
rq = new XMLHttpRequest();
return rq; }
}
rqo = createReqObj();
function PostRequest() {
var cp= document.Captivate;
cp.cpEIGetValue("m_VarHandle");
result1 = m_VarHandle.countid;
result2 = m_VarHandle.cpQuizInfoStudentName;
rqo.open ('POST', 'http://example.de/example.php', true);
rqo.onreadystatechange = receive;
rqo.setRequestHeader ('Content-Type', 'application/x-www-form-urlencoded');
Feld1 = "licence_id=" ;
Feld2 = "test_Name=" ;
rqo.send (Feld1 + result1 + "&" + Feld2 + result2);
}
function receive() {
if(rqo.readyState == 4 && rqo.status == 200){
var ergeb = rqo.responseText;
var WHATtoDO = ergeb.indexOf("|");
if (WHATtoDO > 1) {
elements = ergeb.split("|");
m_VarHandle.cpQuizInfoStudentName = elements[0];
m_VarHandle.lizenzok = parseInt(elements[1]);
cp.cpEISetValue("m_VarHandle");
document.Captivate = cp;
}
}
}
PostRequest();
// Eigentliche Funktion ENDE
});
}
}
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