Sky has warned some of its customers they are likely to receive letters demanding cash for illegally downloaded pornographic films.
The letters, from the Golden Eye company, which has previously targeted O2 customers, threaten legal action.
While Sky stops short of telling users not to pay, it advises them to "carefully read the letter".
The practice of so-called speculative invoicing has been criticised by judges and solicitors in other cases.
Speculative invoicing is defined by the Citizens' Advice Bureau as a "pay up or else" scheme in which "some unscrupulous solicitors and companies... target subscribers to internet services and demand payment from them for copyright infringement to avoid having to go to court
Sky warning over 'cash for porn' letter - BBC News
The letters, from the Golden Eye company, which has previously targeted O2 customers, threaten legal action.
While Sky stops short of telling users not to pay, it advises them to "carefully read the letter".
The practice of so-called speculative invoicing has been criticised by judges and solicitors in other cases.
Speculative invoicing is defined by the Citizens' Advice Bureau as a "pay up or else" scheme in which "some unscrupulous solicitors and companies... target subscribers to internet services and demand payment from them for copyright infringement to avoid having to go to court
Sky warning over 'cash for porn' letter - BBC News