Adaptation of <a href="https://en.wikipedia.org/wiki/File:Free-to-read_lock_75.svg" class="extiw" title="en:File:Free-to-read lock 75.svg">en:File:Free-to-read_lock_75.svg</a>, with consistent name for the series of locks
<a href="//commons.wikimedia.org/wiki/User:Headbomb" title="User:Headbomb">Headbomb</a>
<span class="int-own-work" lang="en">Own work</span>