Trademark?

[Matthijs Frankena]

Hello,

In transposing a song with a text by Walt Whitman, I notice that 
Lilypond converts the "TM" in the last name of the poet to a trademark 
sign (small fontsize, superscript). Any idea how to avoid this?

It does not happen when the name is set in lower case, but I try to 
follow the original and see no need for Lilypond to trademark a name.

TIA and best regards,

Matthijs

***************************************
Lilypond 2.10.1 (happened also in 2.8)

Example:

\version "2.10.0"

\paper {
line-width = 9.0\cm
paper-height = 10.0\cm
}
\book {
\header {
poet = "WALT WHITMAN"
composer = "composer"
}
\score {
{ c'1 }
}
}