How can I protect 3D characters which are used as emoji in a chat app?
<p>I want to protect 3D charecters which are used as emoji in my chat app, how can I do it: copyright (the Copyright office of USA offer a registration service) or as trademarks?  </p>

<p>I am not a lawyer, nor do I have expansive knowledge on the subject, but probably, yes.  Both copyright and trademark them (via the USPTO and the Copyright Office.)</p>

<p>Copyright because they are creative works, and trademark because they are specifically <em>your</em> emoji, distinct from others' emoji, and a brand.</p>

<p>A commenter has noted this, which I shall include verbatim:</p>

<blockquote>
  <p>The USPTO is not essential to the ownership or enforcement of any trademark in the USA -- rights arise from the use in commerce. The Copyright Office does not issue or enforce copyrights, but your copyright may not be enforced in US federal courts prior to filing for copyright registration. 17 USC § 411</p>
</blockquote>

copyright intellectual-property trademark