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<section id="general-encryption-options">
<h1>General encryption options<a class="headerlink" href="#general-encryption-options" title="Permalink to this headline"></a></h1>
<dl class="option-list">
<dt><kbd><span class="option">--protection_scheme <var>&lt;scheme&gt;</var></span></kbd></dt>
<dd><p>Specify a protection scheme, cenc or cbc1 or pattern-based protection
schemes cens or cbcs.</p>
</dd>
<dt><kbd><span class="option">--crypt_byte_block</span></kbd></dt>
<dd><p>Specify the count of the encrypted blocks in the protection pattern, where
block is of size 16-bytes.</p>
<p>There are three common patterns (crypt_byte_block:skip_byte_block):
1:9 (default), 5:5, 10:0.</p>
<p>Apply to video streams with cbcs and cens protection schemes only;
ignored otherwise.</p>
</dd>
<dt><kbd><span class="option">--skip_byte_block</span></kbd></dt>
<dd><p>Specify the count of the unencrypted blocks in the protection pattern.</p>
<p>Apply to video streams with cbcs and cens protection schemes only;
ignored otherwise.</p>
</dd>
<dt><kbd><span class="option">--vp9_subsample_encryption</span>, <span class="option">--novp9_subsample_encryption</span></kbd></dt>
<dd><p>Enable / disable VP9 subsample encryption. Enabled by default.</p>
</dd>
<dt><kbd><span class="option">--clear_lead <var>&lt;seconds&gt;</var></span></kbd></dt>
<dd><p>Clear lead in seconds if encryption is enabled.
Shaka Packager does not support partial encrypted segments, all the
segments including the partial segment overlapping with the initial
clear_lead seconds are not encrypted, with all the following segments
encrypted. If segment_duration is greater than clear_lead, then only the
first segment is not encrypted.
Default: 5</p>
</dd>
<dt><kbd><span class="option">--protection_systems</span></kbd></dt>
<dd><p>Protection systems to be generated. Supported protection systems include
Widevine, PlayReady, FairPlay, Marlin, and
<a class="reference external" href="https://goo.gl/s8RIhr">CommonSystem</a>.</p>
</dd>
<dt><kbd><span class="option">--playready_extra_header_data <var>&lt;string&gt;</var></span></kbd></dt>
<dd><p>Extra XML data to add to PlayReady PSSH data. Can be specified even if
using another key source.</p>
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