When you want to say the ownership of intellectual property, which do you say? You're not going on trial for it.
XYZ claims it has/owns intellectual property that belongs to the product written in this document.
Or
XYZ claims intellectual property that belongs to the products written in this document.
Those don't sound right to me. Better is eg XYZ claims it owns intellectual property related to the product named in this document. But really you need a lawyer's advice.
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Those don't sound right to me.
Better is eg
XYZ claims it owns intellectual property related to the product named in this document.
But really you need a lawyer's advice.