Was heißt »rechtmäßig« auf Englisch?

Das Adjektiv »rechtmäßig« (auch: rechtmässig) lässt sich wie folgt von Deutsch auf Englisch übersetzen:

Deutsch/Englische Beispielübersetzungen

Ich will nur, was mir rechtmäßig zusteht.: I only want what is rightfully mine.; All I want is what's rightfully mine.
Mary und Alice sind ein rechtmäßig verheiratetes gleichgeschlechtliches Paar.: Mary and Alice are a legally married same sex couple.

My legal name is Tom Jackson.
This is a legal gray area.
Tom decided to take legal action.
He wouldn't give me any legal advice so I asked his dog.
Are you the rightful owner?
I don't think what you're doing is legal.
"Here is your ring, Mrs. Sawyer," I interrupted; "it clearly belongs to your daughter, and I am glad to be able to restore it to the rightful owner."
I'm not sure if this is legal.
Is this even legal?
I believe in Spinoza's God, Who reveals Himself in the lawful harmony of the world, not in a God Who concerns Himself with the fate and the doings of mankind.
What we're doing is perfectly legal.
Same sex marriage is now legal in 20 countries worldwide, including Ireland as of yesterday.
The legal age for marriage in Australia is 18.
I don't understand these legal documents.
Just because something is legal, it doesn't mean that it's ethical.
It's not explicitly prohibited, but in fact it is not allowed either. It is a legal limbo.
This is perfectly legal.
Is this money still legal tender?
Should cannabis be legal?
Marijuana is now legal in Colorado.