It would be great if Premium Users had the option to skin their player and add a watermark/logo from the admin options. Not sure if you already have any plans for this, but it would definitely be a great feature to skin the audio and video player as well as allow for embedding the player externally (share player feature).
Nice suggestion. We will look into it.
You can also set watermark for player just by adding some CSS code only.
For example,
.rtmedia-container .mejs-playlist {
background : url('https://rtcamp.com/wp-content/uploads/2013/11/logo1.png') no-repeat center #000000
}
In the url, you can put link of your logo.