A personal seat license, or PSL, is a paid license that entitles the holder to the right to buy season tickets for a certain seat in a stadium. This holder can sell the seat license to someone else if they no longer wish to purchase season tickets. However, if the seat license holder chooses not to sell the seat licenses and does not renew the season tickets, the holder forfeits the license back to the team. Most seat licenses are valid for as long as the team plays in the current venue. As each PSL corresponds to a specific seat, the venue operator can charge different prices for each individual seat. From the fan's perspective, having a specific seat removed the necessity of searching for an open seat in a filled stadium. Newly built sporting venues often offer PSLs to help pay the debt incurred during the construction of the venue. Opponents of PSLs see this as another way to increase the price that fans must afford to attend the venue. Seat licenses have been given various names. In North America, they are primarily called personal seat licenses or permanent seat licenses, while in Europe they are usually called debentures. Origin of seat licenses There are varying accounts as to the origin of the personal seat license. According to one account, the first personal seat license plan was developed in 1986 at Stanford University by legendary tennis coach Dick Gould. Seeking financing for a new tennis stadium, Gould came up with the idea of selling the rights to seats, a licensing plan under which purchaser's name is engraved in the seat, and the purchaser owns the right to have first choice for tickets for any event held in the stadium. According to a second account, the permanent seat license was invented by a Columbus, Ohio architect, Rick Ohanian, in January 1987. Ohanian described his plan in a Letter to The Editor of the Columbus Dispatch, published on March 2, 1987, entitled "Ticketbond is Answer to Financing Proposed Facility". According to a third account, the permanent seat license was invented by Charlotte sports marketing agent Max Muhleman, in 1993. Muhleman is credited as the founder of the first PSLs at Charlotte's then Carolinas Stadium. The idea began as "Charter Seat Rights”, an idea Muhleman suggested to Charlotte Hornets owner George Shinn as a way to reward those who bought season tickets