You could just open an account instead of stealing free data. I know stealing is a strong word, but the word "trick" is what makes it valid. It seems like data should be free to encourage trading, but the exchanges use it to generate cash, and they are very aggressive about enforcement.
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Depends on what a long time ago is. According to Vision, FCM:
CME regulations require you wait 12 months:
(i) Access to market data in the simulated environment is limited to 30 days
(ii) Distributor must ensure that Subscribers can not gain access to the simulator for more than 30 days, within a 12 month rolling period
(iii) Subscriber level information must be tracked and reported as per standard reporting policy.
So yes, they track demo user data as required by the exchange, and restrict access based on prior use within the regulated period. But if you had a demo on the same feed, and it was more than 12 months ago, and they aren't letting you connect, it could be due to incorrect records on their end.
I recently opened a demo account for Rithmic through Optimus, and had one hell of a time chasing disconnect problems continously for 2 weeks, which none of the support people at either the broker, FCM, or Rithmic could figure out. Eventually they said it was because I had multiple previous demos that I didn't, their records were all wrong. Finally they removed the restriction after a lot of trouble, and when asked, Rithmic said it was just a mistake on their end and apologized. So if that's the case, you should go to the broker/fcm/feed, and thoroughly investigate the reason for the login error (it can take some time/tries), and it would help if you have the e-mail record of your last demo to show it was more than 12 months ago.
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Mirus checks your computers IP address and if you already received a free demo, no more demos. And yes this is per CME. So you can either use another computer or per NT, they sent me these options for a free real-time data trial for futures: