legally

As permitted by law; not contrary to law.

You can legally park in the lot on weekends without paying the fee, they won't ticket you.

On the question of whether a memorandum of understanding is legally binding, British courts have held that this is determined by the presence (or, as the case may be, absence) of an intention to create a legal obligation, on the part of the states parties concerned, at the time of entry into the arrangement.

From a legal perspective.

Legally, I think you are covered, but there are angry guys with baseball bats outside.

After filing paperwork to change his name, the rapper, born Kanye Omari West, finally got what he asked for, and will be legally known as “Ye.”