[Typo3] hide the tt_content field "type" for BE user

[Pierre Rouwens]

Hi list,

I'm trying to configure TYPO to hide the field type in tt_content, i m 
using templavoila with freesite and i dont wanne the BE user to modify 
the type i choose for the place.
i m almost sure i have to play with TCA or TBE but i'm not really sure 
of this...I'm looking in the doc but if you have any clues it'll be welcome.

Thanks in advance for any help

Pierre