Hwy XMan35, The answer is YES. You must obey the copywriting rules and regulations about tiktok videos. In fact, some accounts are dedicated to reposting other people’s videos. So, you can see that it’s always best to get the creator’s permission beforehand to avoid any complaints. TikTok discourages its users from reposting each other’s content by including a TokTok watermark with the username on saved and reposted videos. So, you think someone is using your tiktok videos without permission, you can easily report her or his account.