A proposed government bill may force television quiz shows that feature phone-in competitions to make the questions more difficult.
Shows such as Who Wants to be a Millionaire use phone-ins
Quiz shows such as Who Wants to be a Millionaire? ask would-be contestants to answer a question over the phone to be in with a chance of qualifying.
The broadcasting industry is said to have made around £50m from phone-in competitions in the past year.
However, it is causing concern for some charities running similar competitions.
Those charities that are dependent on lottery money claim that phone-ins where questions are too easy pose a threat to them by taking away some of their profits.
"If the question in a phone-in competition is too easy, it effectively becomes a lottery," a spokesman for the Department of Culture, Media and Sport (DCMS) told BBC News Online.
"You need a licence to run a lottery and the profits must go to charity - which they don't in the case of these phone-in competitions."
The DCMS added that in the case of quiz shows, such phone-ins were skill tests - and as such should prevent people who did not know the answer to the questions from entering.
Celador, who make Who Wants To Be A Millionaire?, declined to comment on the move.
The draft version of the bill - known as the Gambling Bill - ruled last year that all prize competitions not run by charities should be banned if the level of skill to enter does not prevent anyone from taking part.
However, a spokesman for the joint parliamentary committee working on the bill said they were still unsure how the ruling would work.