"provisions" are the agreements made in a contract.  You might say they are the условия (договора).

"proprietary rights" means the rights (права) that an owner (владелец) of property or a business has.  Proprietary rights are the право собственности.

Therefore, "ownership of proprietary rights provisions" are the agreements in a contract that set forth who will own the proprietary rights, and may also state exactly what those rights will be.  I will try to translate the entire phrase into Russian.  Hopefully, you will understand me even if I don't say it correctly:    "ownership of proprietary rights provisions" are "условия по праву собственности владелца."