Public bodies and private corporations including internet giant Google are flouting the public's right to access personal data being held on them, according to a major new international study.
Researchers found that nearly half of data holders either failed to disclose the private information they stored on citizens or did not give a legitimate reason for not doing so when asked.
Among the organisations contacted in the pan-European study carried out by Sheffield University were banks, healthcare providers, supermarkets, universities, security firms as well as the United States search-engine company.
Attempts to find information were routinely met with serial malpractice as well as obfuscation and ignorance of obligations under the law, it was claimed.
Campaigners described the findings as "shocking" and accused regulators and legislators of failing to safeguard citizens' rights.