CCP Games took an innovative approach to the problem. Players of EVE Online can buy game time with cash and then trade it with other players as in-game "Pilots License EXtensions" (PLEX). This lets people with cash to spare effectively purchase ISK from other players, while those with plenty of in-game ISK can effectively play for free. With a legitimate method for buying ISK, players needn't face the inevitable threat of bans and key-loggers from nefarious sources. Fearing that the market for PLEX might not take off if they were at risk of being lost during transport. To combat this issue, CCP made it impossible to move them from the station they were redeemed at.
In a new devblog, CCP Zulu explains plans to remove all the transport restrictions on PLEX. In addition to being able to undock with a PLEX in your cargo hold, you'll also be able to place them into courier contracts. When these changes come into effect, you might see someone hauling game time from station to station. If you plan to move any PLEX around, be extremely wary of suicide attacks. EVE's darker social element routinely scans passers-by in high-security space, looking for juicy targets to gank. The possibility of finding game time amongst the loot may send them into overdrive. The changes are due to come into effect on Tuesday the 13th of July.