Kyodo News reports:
Police on Tuesday arrested a former employee of a Tokyo medical recruitment agency on suspicion of illegally copying the personal data of around 17,000 doctors and nurses.
Kengo Mikami, 36, is suspected of copying the confidential information on or around May 30, 2012, while working as a systems engineer for the company now called MRT Inc., investigative sources said.
The data, copied from an online storage service, included names, addresses, dates of birth, academic records and details of workplaces.
Read more on Japan Times. This sounds like another case of insider theft to help start a competing firm.