Is the marketing plan an intellectual property right?

The relevant provisions of the patent law:

Inventions and utility models granted patent rights should be novel, creative and practical.

Novelty means that before the filing date, no identical invention or utility model was published in publications at home and abroad, used in China or known to the public in other ways, and no identical invention or utility model was applied to the patent administration department in the State Council by others and recorded in the patent application documents published after the filing date.

Creativity means that compared with the prior art before the filing date, the invention has outstanding substantive features and remarkable progress, and the utility model has substantive features and progress.

Practicality means that the invention or utility model can be manufactured or used and can produce positive effects.

Does not include the marketing plan.

But your company can use the contract law to protect its legitimate rights and interests.