There are a few things you can do to post on TikTok without infringing on copyright. First, make sure that the video you’re posting is not copyrighted. If it is, make sure to include a link back to the original source. Second, be aware of how your video might be perceived by other users. Make sure that your video is appropriate for a public audience and does not contain any content that could be considered offensive or indecent. Finally, make sure that you have permission from the copyright holder before posting.