I found this great link here on Medium by Harris Sockel.
<copy/paste>
Writers on Medium automatically own the copyright to their stories; more detail on that here >> https://policy.medium.com/medium-terms-of-service-9db0094a1e0f. With that in mind, it’s probably not necessary to add a copyright mark.
We do have a feature that enables writers to customize the licensing on their posts (for example, you can choose a creative commons license if you want to permit others to remix/copy your work). I wonder if that’s what you’re seeing? It’s totally optional and accessible in the “settings” of your story; more on that here: https://help.medium.com/hc/en-us/articles/214741758-Set-a-content-license
Anyway, I hope that helps!
-Harris, Creator Support @ Medium
Also, upon further reading about Medium’s copyright policy, I <copy/paste> the following directly off Medium’s support page:
— — — — —
Rights and Ownership
You retain your rights to any content you submit, post or display on or through the Services.
Unless otherwise agreed in writing, by submitting, posting, or displaying content on or through the Services, you grant Medium a nonexclusive, royalty-free, worldwide, fully paid, and sublicensable license to use, reproduce, modify, adapt, publish, translate, create derivative works from, distribute, publicly perform and display your content and any name, username or likeness provided in connection with your content in all media formats and distribution methods now known or later developed on the Services.
Medium needs this license because you own your content and Medium therefore can’t display it across its various surfaces (i.e., mobile, web) without your permission.
— — — — -
Hope this helps.
