Maybe. I suggest you to contact Metaquotes directly if you have any evidence that a subscriber is reselling a signal.
Do you have any proposal on the way to prevent that ?
Metaquotes are the authors of MT4 and MT5 platform. So it could be a question of them introducing two strict user modes for any trading account on both Metatrader platforms. One mode could be subscriber only and here the ftp tab would be disabled and brokers and social trading sites that use metatrader would not accept signals from accounts of the 'subscriber' type. The other mode would be publisher and here the signals tab (under options) would be disabled and traders/ social trading sites would be blocked from copying trades to accounts of 'publisher' type.
Just my suggestion. Someone could come up with something better.
First of all, I believe that the very most of the subscribers are following the rules and that this is the only way to have quality of service, since you have a MQ server side solution to copy trades.Maybe there are bad guys, but if so, they have a bad signal and probably bad results.
Moreover, I don't think there is an easy solution, since even if you have a publisher or subscriber accounts, anyone that follows a signal need access to the account. And if you have access you can use a program to copy trades.
Maybe you could create an account with a delay to the subscriber access the account, but this looks like very risky, since you can lose control of the account.
And this looks like too much effort to solve an unlikely problem.
the signal has to be very good for someone to pay. And it would be easy to write analyzer for CVS transaction logs that would detect the theft. (for example looking for the same transactions with set slippage like 5 or 10 seconds max; there are not many signals that are paid and have subscribers, not to be able to check them with automated script/program. It would require much memory though) So even if someone is not caught now, he can get caught in the future.
Really not worth it! That's my advice to all the thieves.
PS. kind of virtually undetectable theft would be copying signals from MQL5 site to some external PAMM account. But there always will be bad-guys, you cannot regulate everything.