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4. Limits on using our intellectual property

If you use content covered by intellectual property rights that we have and make available in our Products (for example, images, designs, videos, or sounds we provide that you add to content you create or share on YHSN), we retain all rights to that content (but not yours). You can only use our copyrights or trademarks (or any similar marks) as expressly permitted by our Brand Usage Guidelines or with our prior written permission. You must obtain our written permission (or permission under an open source license) to modify, create derivative works of, decompile, or otherwise attempt to extract source code from us.