Attorney-General Simon Corbell expects to table legislation this week that will outlaw scalping, ban pitch invasions and restrict patrons from re-entering venues after being evicted.

Scalping is the on-selling of tickets for events, usually at a profit. Mr Corbell has given no details of his legislation and has not said how scalping will be defined, but online ticket trading website Viagogo is concerned about the impact.

Spokesman Alex Levenson said legitimate and authorised trading sites could be unfairly disadvantaged, pushing sales to the black market.

''We are a consumer-to-consumer marketplace where if you have extra tickets to an event, or can’t go or bought too many or whatever your reason might be, we facilitate you finding someone to buy the ticket,” he said. “We create a safety and security for the buyer in the process and provide a guarantee.”

Deputy Chief Minister Andrew Barr said last week the legislation would be introduced to help Canberra prepare to host major sporting events including Cricket World Cup games, Asian Football Cup fixtures and January's Big Bash League cricket final.

The laws will bring the ACT into line with other states and territories and some changes are required as part of agreements with major event and sporting competition organisers.

Viagogo, founded in Britain in 2006, says it has agreements with AFL clubs including Collingwood and Richmond, as well as NRL club the Sydney Roosters.

Right now ticket sales on the site, where you will be directed if you try to buy tickets for Asian Cup games through a site called ticketaustralia.com, are offered at much higher prices than through the official ticketing site.

At afcasiancup.com, two adult tickets in the best seating category for the game between Korea and Oman at Canberra Stadium on January 10 will cost you $66, including postage.

Sellers on Viagogo offer two adult tickets in the same seating section for $130 each, plus a booking fee of $39, bringing the cost to $299. The site points out that the "face value" of tickets for the game is $5 to $30.

For the United Arab Emirates v Qatar game the following day, one seller charges $43.33, plus a $6.50 booking charge, for an "upper tier" seat further back in the stadium, although it is not clear exactly where.

The best seats for the same game through the official site will cost you $30.58 plus $4.95 postage.

Mr Levenson said when you buy a ticket, as when you buy "a car, a chair or a house", you should be able to do with it what you please.

“If you restrict someone’s ability to resell a ticket that they buy and spend their money on before their plans change or something happens, it’s opening the can in terms of control of the event. Who knows what the promoter or the rights holder might do?”

Mr Barr said the new legislation was timely, with the Big Bash League final at Manuka Oval on January 28 and three World Cup cricket matches at Manuka in February.