However, True-Name Nemesis's "protection from [a player]" applies only to four specific things. In general:
Damage that a source controlled by that player would deal to True-Name Nemesis is prevented.
Nothing controlled by that player can be attached to True-Name Nemesis.
Creatures controlled by that player can't block True-Name Nemesis.
True-Name Nemesis can't be the target of spells or abilities that player controls.
(See C.R. 702.16k for a more precise statement.) As with any other protection ability, "protection from [a player]" doesn't mean that True-Name Nemesis can't be affected in any way by anything controlled by the given player. (Review C.R. 702.16.) For example, True-Name Nemesis can still be destroyed by a spell that player controls that neither causes damage to anything nor targets anything (e.g., Wrath of God).
In general, True-Name Nemesis can still be removed from the battlefield by spells and abilities as long as they don't touch on any of the things "protection from [a player]" cares about.
The Precious
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Diabolic Edict
Runed Halo
Wrath of God
Night of Souls' Betrayal
However, True-Name Nemesis's "protection from [a player]" applies only to four specific things. In general:
In general, True-Name Nemesis can still be removed from the battlefield by spells and abilities as long as they don't touch on any of the things "protection from [a player]" cares about.
See also this thread and this thread.
The Precious
B___U___G___R___W