http://codex.wordpress.org/Function_Reference/remove_meta_box
function remove_custom_meta_form() {
remove_meta_box( 'postcustom', 'post', 'normal' );
remove_meta_box( 'postcustom', 'page', 'normal' );
}
add_action( 'admin_menu' , 'remove_custom_meta_form' );
HTH
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