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<div class="section" id="general-encryption-options">
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<h1>General encryption options<a class="headerlink" href="#general-encryption-options" title="Permalink to this headline">¶</a></h1>
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<dl class="option-list">
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<dt><kbd><span class="option">--protection_scheme <var><scheme></var></span></kbd></dt>
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<dd><p>Specify a protection scheme, ‘cenc’ or ‘cbc1’ or pattern-based protection
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schemes ‘cens’ or ‘cbcs’.</p>
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</dd>
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<dt><kbd><span class="option">--vp9_subsample_encryption</span>, <span class="option">--novp9_subsample_encryption</span></kbd></dt>
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<dd><p>Enable / disable VP9 subsample encryption. Enabled by default.</p>
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</dd>
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<dt><kbd><span class="option">--clear_lead <var><seconds></var></span></kbd></dt>
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<dd><p>Clear lead in seconds if encryption is enabled.
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Shaka Packager does not support partial encrypted segments, all the
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segments including the partial segment overlapping with the initial
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‘clear_lead’ seconds are not encrypted, with all the following segments
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encrypted. If segment_duration is greater than ‘clear_lead’, then only the
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first segment is not encrypted.
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Default: 5</p>
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</dd>
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<dt><kbd><span class="option">--protection_systems</span></kbd></dt>
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<dd><p>Protection systems to be generated. Supported protection systems include
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Widevine, PlayReady, FairPlay, Marlin, and
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CommonSystem (<a class="reference external" href="https://goo.gl/s8RIhr">https://goo.gl/s8RIhr</a>).</p>
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