Under the contract of commercial concession, LLC Raduga granted the individual entrepreneur Fokin the exclusive right to a service mark. The contract was made in writing and registered. The individual entrepreneur Zaitsev, who used the same service mark under the company's license, applied to the court with a demand to recognize the contract of commercial concession as invalid.
Solve the dispute.

After payment you will be available a link to the solution of this problem in the file of MS Word. It should be noted that the problem solutions put up for sale were successfully handed over in the period 2003-2018 and could be outdated. However, the general algorithm will always remain true.