Меня смущает subject matters of intellectual property rights (как-то во мн.ч. глупо звучит)

Вот такой у меня вариант перевода получился:
The Contractor agrees that once the Certificate of Acceptance of the performed Works is signed resulting in obtaining by the Customer of the materials, works which are the subject matter of copyright or related rights created either directly by the Contractor or by its Subcontractor or a Third Party, all exclusive ownership rights and related rights to all subject matters of the intellectual property right listed in the relevant Appendix are transferred to the Customer in full for unlimited period and unlimited territory unless otherwise stipulated in the relevant Appendix

Меня смущает subject matters of intellectual property rights (как-то во мн.ч. глупо звучит)

Вот такой у меня вариант перевода получился:
The Contractor agrees that once the Certificate of Acceptance of the performed Works is signed and as a result the Customer has obtained the materials, works, which are the subject matter of copyright or related rights, created either directly by the Contractor or by its Subcontractor or a Third Party, all exclusive ownership rights and related rights to all subject matters of the intellectual property right listed in the relevant Appendix are transferred to the Customer in full for an unlimited period and unlimited territory unless otherwise stipulated in the relevant Appendix