iphone development and jailbreak
<p>I am new to iphone development.
We can develop iphone applications through:</p>

<ol>
<li>legal</li>
<li>jail breaking</li>
</ol>

<p>If I jail break my iphone OS, after that can I install latest version of iphone OS
and make it as legal again from apple site?</p>

<p>If I develop jail break applications, can I install it in iphone without apple
authorization like provisioning, certificates etc.?</p>

<p>Why apple did not protect against these operations (jail breaking)?</p>

<p>How do the companies which provide jail breaking software know the apple iphone os  structure?</p>

<p>Why did apple develop iphone OS without protection, security?
For example if I use BREW, it is protected by qualcomm.</p>
