The phrase "voluntarily provided" is correct and commonly used in written English.
It is typically used to describe something that is given or offered without being requested or required. Example: The company's privacy policy states that all personal information is voluntarily provided by users when creating an account.
Mr Abadi has voluntarily provided information to the Argentine authorities.
On my initiative, I have voluntarily provided all of these documents to the U.S. attorney's office.
He said he voluntarily provided his fingerprints, DNA samples and prints of the soles of his shoes.
"After obtaining I.S.M.'s consent, Thomson Reuters voluntarily provided a copy of the contract with the pricing details omitted".
The company said that it had "already voluntarily provided" many of the subpoenaed documents to the Securities and Exchange Commission, which is conducting a separate investigation.
In another shift, the I.R.S. will generally not prosecute taxpayers who come forward voluntarily, provided they are not drug dealers, arms merchants or others with ill-gotten gains.
The police, however, said on Twitter that "based on the video voluntarily provided by a witness, the subject did not have his hands up in the air".
Not only are we operating in accordance with our union contract, but we have also voluntarily provided a severance package for our displaced teachers.
It had been professionally edited from a collection of 219 DVDs covering hundreds of hours of practices, material that Rutgers had voluntarily provided to Eric Murdock, the former assistant, after his departure.
The Stuxnet programmers are reported to have exploited proprietary information that had been voluntarily provided to the American government by Siemens, that German company that makes data-and-control programs used in nuclear power facilities — including Iran's.
He claims that the longer period somehow impinges on privacy, yet there are no such strict limits on how long other agencies and organizations -- including the Internal Revenue Service, the Census Bureau, registries of motor vehicles or even private credit-rating firms -- may hold onto similar, voluntarily provided information.
