I know enough about the system to know that every installation requires a signature by Apple. There&#x27;s no &quot;belief&quot; required here.<p>Note that the creator of cydia, the software that pretty much every jailbroken iPhone runs to install packages, has said that Cook is lying in the letter. He&#x27;s also said that many people, including him, could create the software in less than a week, and all they need is the signing key.<p>You can trust Cook, but perhaps educate yourself to the point you don&#x27;t need to trust anyone. Read <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;SHSH_blob" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;SHSH_blob</a> and <a href="https:&#x2F;&#x2F;www.theiphonewiki.com&#x2F;wiki&#x2F;SHSH" rel="nofollow">https:&#x2F;&#x2F;www.theiphonewiki.com&#x2F;wiki&#x2F;SHSH</a>, and you&#x27;ll see how there&#x27;s no additional risk by creating the software, as long as the key is not released.