Does reposting affects SEO?

There are public domain audio books which are free. I want to have some in my channel, but instead of making it I will just download from another user and reupload to my channel.
Does that affect video SEO on youtube?
Can I do something so youtube doesnt think it's the same video, like change md5 hash or something?

Im using this method with adding some music to videos and cutting some seconds but i feel like this method hurt ranking . Anyone can confirm this ??

Any help ??