The key to massive topspin

[MasterTS]

The legend writ,
the stain affected.
The key in Silence, undetected.
Fifty-five in iron pen,
Mr. Matlack can't offend.

 

[pNoyr3D]

WTF!! Um.. So can anyone decifer this code and tell me the key..?

 

[nViATi]

It's from the movie National Treasure