Oscars organisers have been given the identity of someone who tried to sell two tickets for this year's ceremony without permission for $5,000 (£2,516).
A judge in Los Angeles ordered website Craigslist, where the tickets were offered, to reveal the vendor's name.
The Academy of Motion Pictures Arts and Sciences said that person would join other individuals and companies it was suing for selling or brokering tickets.
It said invitees were forbidden from selling these for security reasons.
Lawyer David Quinto, for the Academy, said: "If you don't know who's inside the theatre, it's very difficult to provide security."
'Trespasser'
The poster identified themselves on Craigslist only as Daniel.
In March, the Academy announced it was suing a number of parties over the sale of tickets. Some of these cases have now been thrown out.
Those attending February's ceremony were explicitly told they could not give away or sell their tickets, court documents stated.
Mr Quinto said the Academy was keen to find out who had bought the tickets.
It considers anyone who uses someone else's ticket to be a trespasser at the event in Los Angeles.
BY-BBC NEWS
