Why is OM paid sevice, aren't the game free to distribute without any copyrights?
The game as such does not have copyright, thefore it belongs to everybody. The game is considered as event and therefore people cannot claim copyrights for events which happened in the past. However the collection as such in form of the database, the quantitative methods, statistical measurments, and time spent on creation of this database this is copyrighted. It is paid service becasue of the associated costs while producing this database (internet connection, energy, hardware used, time spent). The authors would like to build a great community around the chess openings, but would like to ask a symbolic price (20 or 40 EUR) to cover for the expenses incurred.