What is the ruling on purchasing a "CPanel" software license at a reduced price from companies that provide the service by sharing the original license with several subscribers, or from companies that may use non-original software, and is it permissible to deal with them without verifying their methods of operation?

It is forbidden to deal with a company that is clearly stealing the original license. As for companies that share the original license among subscribers, the ruling on dealing with them depends on the terms of the original company: if it does not prohibit sharing, then there is no harm. However, if it does prohibit it, then it is obligatory to abide by the condition. This is the ruling regarding the service provider's condition that the buyer must utilize the benefit himself and not allow others to do so, and this is a valid and binding condition.