First of all, I apologize for my english because I use google translate.I found a solution for BBcodes to be invisible to the unregistered.It is tested both in VB 5.2 and 5.3.3.
Admincp » Languages & Phrases » Phrase Manager » Add New Phrase
Phrase Type : GLOBAL
Product : vBulletin
Varname : hide_code
Text : Please Login or <a href="register.php">Register</a> to see codes
Go to your Admincp » Styles & Templates » Style Manager » Your Style » BB Code Layout Templates

Open bbcode_code will see this code:
<vb:if condition="$vboptions['codemaxlines']">
{vb:set verticalPadding, 12}
{vb:set horizScrollbarAllowance, 20}
{vb:set blockCssHeight, {vb:math {vb:raw blockheight} * {vb:stylevar bbcode_code_line_height} + {vb:raw verticalPadding} + {vb:raw horizScrollbarAllowance}}}
</vb:if>
<div class="bbcode_container">
<div class="bbcode_description">{vb:rawphrase code}:</div>
<pre class="bbcode_code"<vb:if condition="$vboptions['codemaxlines']"> style="height:{vb:raw blockCssHeight};"</vb:if>>{vb:raw code}</pre>
</div>

Substitute for this one. Always remember that the id of users will be the ones of your forum. (Usually unregistered ID: 1) (For other users you choose who has permission)

<vb:if condition="$vboptions['codemaxlines']">
{vb:set verticalPadding, 12}
{vb:set horizScrollbarAllowance, 20}
{vb:set blockCssHeight, {vb:math {vb:raw blockheight} * {vb:stylevar bbcode_code_line_height} + {vb:raw verticalPadding} + {vb:raw horizScrollbarAllowance}}}
</vb:if>
<div class="bbcode_container">
<div class="bbcode_description">{vb:rawphrase code}:</div>
<vb:if condition="is_member_of($user, 2, 3, 6, 29, 31)">
<pre class="bbcode_code"<vb:if condition="$vboptions['codemaxlines']"> style="height:{vb:raw blockCssHeight};"</vb:if>>{vb:raw code}</pre>
</vb:if>
<vb:if condition="is_member_of($user, 1)">{vb:rawphrase hide_code}
</vb:if>
</div>


The same code can be used for html_code and php_code. Changing of course {vb: rawphrase code} for the corresponding one in each case for html {vb: rawphrase html_code} and for php {vb: rawphrase php_code}

Any doubts or clarifications in comments, as well as if they were useful, I did several hours to find this solution and I hope it will be useful