MPL License Questions

Hello,

i am about to write an Application that is open source under MPL 1.1. 
(This is not related to the Mozilla Browser at all, i hope it is still 
on-topic here)

The MPL allows other people to take my code and libraries and use it in 
their programs, but they do not need to release their own code under any 
open source license (unless it is a modification of my MPLed Code).

However, what i do not understand: Can I take my Code that has been 
released under MPL 1.1 before and release it under another license that 
is not MPL or even Open Source compatible? (Read: Can I take my Code and 
  sell it in a commercial/properitary closed source application)

I searched on the web and found this:
http://www.croftsoft.com/library/tutorials/gplmpl/

"The GPL prevents code from being sold by itself or as part of a larger 
work. However, it leaves the door open for the authors to commercially 
sell the code under different licensing terms if they so choose." (The 
whole paragraph.

 From what I understand:
If you release Code unter GPL, you can later on revoke this license and 
say: No, this code is not GPL anymore. Do not distribute it.
The MPL does not allow this "revokation" - Code that has been released 
under MPL is available under MPL forever.

That means to me: I can take this Code and use it in properitary 
Products without obeying the MPL, but I cannot forbid people who got the 
Code already to use it under the Terms of MPL.

Is that correct? May I take my own Code that has been made available 
under MPL and use it in other ways too without obeying MPL/Open Source?
I understand it that i still own all "copyright" or better: Intellectual 
Property on this code, and the main difference to LGPL is that i cannot 
revoke the MPL License from released Code anymore.

(Note: I am here always talking about MY own code. Of course, i cannot 
simply take any MPLed-Code from other people and use it like I want.)

Thanks in advance for input! ;-)