Spanish to English Law/Patents Computers: Software

The excerpt comes from the 'definitions' section of a software project contract. I'm confused about the meaning of 'manifestar', as well as what the grammatical subject(s?) of the verbs 'manifestar' and 'contar' here are:

Software de Terceros.- Programas de cómputo usados como herramientas de desarrollo en sus versiones comerciales, sobre las cuales manifiesta cuenta con todos los derechos para otorgar sublicencias y/o transmitir derechos patrimoniales y/o ceder los mismos de manera derivada u originaria, entregando a EL CLIENTE el Software con todos los derechos para usar y disponer de los derechos patrimoniales del programa de computo objeto del presente contrato durante el plazo acordado por las partes.

Here is my attempt so far:

Third-Party Software.- Computer programs used as development tools in their commercial versions, invoked include all rights to sublicense and/or transfer and/or cede derivative or original property rights, supplying the software to CLIENT with all rights to use and exercise proprietary rights to the computer program in question during the period agreed upon by the parties.

Thanks in advance for your help!