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@@ -3002,6 +3002,7 @@ current <code>title</code> and <code>track</code>:</p>
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+<p>A license callback can also declare optional keyword arguments. <code>get_widevine_license</code> can ask for <code>pssh</code> and <code>session_id</code>. <code>get_playready_license</code> can ask for <code>pssh_b64</code> and <code>session_id</code>. <code>session_id</code> is the open CDM session. A callback gets only the arguments that its signature declares.</p>
 <div class="language-python highlight"><pre><span></span><code><span id="__span-19-1"><a id="__codelineno-19-1" name="__codelineno-19-1" href="#__codelineno-19-1"></a><span class="k">def</span><span class="w"> </span><span class="nf">get_widevine_license</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="p">,</span> <span class="n">challenge</span><span class="p">:</span> <span class="nb">bytes</span><span class="p">,</span> <span class="n">title</span><span class="p">,</span> <span class="n">track</span><span class="p">):</span>
 </span><span id="__span-19-2"><a id="__codelineno-19-2" name="__codelineno-19-2" href="#__codelineno-19-2"></a>    <span class="n">response</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">session</span><span class="o">.</span><span class="n">post</span><span class="p">(</span>
 </span><span id="__span-19-3"><a id="__codelineno-19-3" name="__codelineno-19-3" href="#__codelineno-19-3"></a>        <span class="bp">self</span><span class="o">.</span><span class="n">license_data</span><span class="p">[</span><span class="s2">"url"</span><span class="p">],</span>