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Answer analysis: (1) Company D's leasing of CNC machine tools does not infringe the patent rights of Company A. According to the regulations, after the products manufactured by the patentee are sold, using or selling the products is not regarded as infringing the patent rights. (2) Company D's leasing of CNC machine tools infringes the copyright of Company B .... According to the law, those who rent movie works, works created by similar methods, computer software, audio and video products or copyright-related rights holders without permission shall bear tort liability. Ding's behavior belongs to copyright infringement. Infringed the copyright of company B's software. (3) Company B cannot use software B in China. According to the regulations, in the copyright licensing contract, the user who has obtained the exclusive right to use the work has the right to exclude all others including the copyright owner from using the work in the same way. (4) Company A cannot allow a third party to use software B in China. According to the regulations, in a copyright licensing contract, if a user who has obtained the exclusive right to use copyright authorizes a third party to exercise the same right, he must obtain the permission of the copyright owner, unless otherwise agreed in the contract. In addition, without the consent of the copyright owner, the other party may not exercise the rights that the copyright owner did not explicitly license in the copyright licensing contract. In this topic, because the contract does not stipulate whether Company A can license a third person to use the software, Company A cannot license a third person to use the software in China. (5) Company C's change of registered trademark A infringes the trademark right of Company B ... According to the regulations, it is an infringement of the exclusive right to use a registered trademark to change its registered trademark and put the goods with the changed trademark on the market without the consent of the trademark registrant.