In the legal environment of different countries, multiple patent or trademark registrations for the same product can increase the difficulty of competitors in legal proceedings through the following means: 1. **Graded patent registration**: register patents of different levels in different countries, for example, register a major patent in the United States and a patent for a minor improvement in China, so that competitors need to deal with multiple patent lawsuits at the same time. 2. **Combination patent registration**: register multiple patents, each covering different aspects of the product, for example, one patent covers the appearance of the product, another patent covers the function of the product, etc. 3. **Quick patent registration**: register patents quickly in key markets to gain priority before competitors. 4. **Trademark registration**: register trademarks, including logos, names, colors, shapes, etc. to protect the brand and identity of the product. 5. **Copyright registration**: register copyrights, including software, documents, designs, etc., to protect the creativity and intellectual property rights of the product. 6. **R&D record preservation**: preserve R&D records, experimental data, test results, etc., which can be used as evidence for patent and trademark registration, and can also be used to prove the innovation and originality of the product. 7. **International Patent Cooperation Treaty (PCT)**: Using the PCT system, patents can be registered in multiple countries at the same time, simplifying the patent registration process. 8. **European Patent Convention (EPC)**: Using the EPC, patents can be registered in multiple European countries at the same time, simplifying the patent registration process. 9. **International Trademark Registration**: Using the Madrid System, trademarks can be registered in multiple countries at the same time, simplifying the trademark registration process. 10. **Patent Maintenance and Renewal**: Regularly update and maintain patent and trademark registrations to ensure the validity and effective period of intellectual property rights. Through these means, companies can increase the difficulty of patent and trademark litigation against competitors and protect their own intellectual property rights and competitive advantages.