rechtmäßig in inglese:

He recognized his son as lawful heir.

I think putting thieves to death is not lawful; and it is plain and obvious that it is absurd and of ill consequence to the commonwealth that a thief and a murderer should be equally punished.

When a president or a governor acts wisely and lawfully, Americans express their approval by reelecting him and by supporting his political party.

We have a legal obligation to pay our taxes.

Was the Missouri Compromise legal?

Slavery was legal there.

Legal services will be provided by lawyers and other experts to be appointed by the government.

In legal documents, difficult words and phrases are often used.

The legal system in America is the world's finest.

Common-law relationships are not legal unions in France.

In many places it isn't legal to walk a dog on the beach.

Much legal language is obscure to a layman.

The widespread application of administrative guidance is considered to be a uniquely Japanese practice in which bureaucrats exert authority, without any legal backing, telling the private sector what to do and what not to do.

A legal kiss will never equal a stolen one.

The U.S. would be nothing without its immigrants, legal and illegal.

A marriage is not legal unless certain declarations are made.

Legal changes threaten online sales in digital commerce.

In legal terms, children are called "issue."

Which prince is the legitimate heir to the throne?

We consider public libraries a legitimate citizen's right.

The Cockney mode of speech, with its unpleasant twang, is a modern corruption without legitimate credentials, and is unworthy of being the speech of any person in the capital city of the Empire.

I was robbed of my rightful share.

However, if stolen goods are later recovered by the police, the ID tags provide a way for them to get in touch with the rightful owner and arrange for return of the goods.