The personal details of millions of motorists have been sold to parking firms and clampers by a Government agency in a trade generating £43.9million so far.
More than 18million names and addresses have been passed to private sector companies in the past five years by the Driver and Vehicle Licensing Agency so that they can be issued with fines
Access to the database was halted last year after complaints about improper use of the data when it was to be used in an advertising campaign for Castrol after the DVLA's assertion that it had not authorised its use.
The government trade in drivers' details helps to support a parking enforcement industry on private land worth an estimated £1billion
Private parking companies can get a driver's name and address by submitting their vehicle registration numbers and filling in a form confirming that they are pursuing an alleged parking offence.
The DVLA charges £2.50 a time for information from this database of 38million drivers.
Revenue from the trade has risen every year from £4.7million in 2004-5 to £9.2million for 2009-10.
Motoring organizations are concerned at evidence of this data falling into the wrong hands as a result of parking, clamping and other unvetted firms buying the details.
"This shows there is a huge Big Brother system run by the state which is in cahoots with parasite-parking companies and clamper." Said the Liberal Democrat MP Bob Russell, who gained the information from a parliamentary question.
"I find it wrong that the state is allowing itself to be used by parking companies to rip off drivers. They are using information given in good faith by drivers. It is totally wrong and no driver is safe."
Ministers agreed, last November, to implement every aspect of our Curb the Cowboy Clampers manifesto, including giving drivers an independent right of appeal.
A DVLA spokesman said: "The DVLA knows it is vitally important to safeguard the information it releases from misuse and has a range of robust measures in place to protect data.
"Any evidence of abuse will be referred to the Information Commissioner for investigation and, where appropriate, prosecution."
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