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<li class="nav-item nav-item-this"><a href="">General encryption options</a></li>
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<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">--crypt_byte_block</span></kbd></dt>
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<dd><p>Specify the count of the encrypted blocks in the protection pattern, where
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block is of size 16-bytes.</p>
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<p>There are three common patterns (crypt_byte_block:skip_byte_block):
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1:9 (default), 5:5, 10:0.</p>
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<p>Apply to video streams with ‘cbcs’ and ‘cens’ protection schemes only;
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ignored otherwise.</p>
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</dd>
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<dt><kbd><span class="option">--skip_byte_block</span></kbd></dt>
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<dd><p>Specify the count of the unencrypted blocks in the protection pattern.</p>
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<p>Apply to video streams with ‘cbcs’ and ‘cens’ protection schemes only;
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ignored otherwise.</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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<a class="reference external" href="https://goo.gl/s8RIhr">CommonSystem</a>.</p>
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</dd>
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<dt><kbd><span class="option">--playready_extra_header_data <var><string></var></span></kbd></dt>
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<dd><p>Extra XML data to add to PlayReady PSSH data. Can be specified even if
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using another key source.</p>
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</dd>
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</dl>
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