in november  castle technology ltd released a modified version of paces -bit risc os as risc os  for their iyonix pc in apparent contravention of the licence agreement that riscos ltd held with element  in july  castle bought all technology rights to risc os from pace in an attempt to legalise the situation in january  castle also took over tematic ltd the company formed by ex-pace engineers when they were made redundant in march  the result was a long-running and acrimonious dispute between riscos ltd and castle over licensing which ultimately lead to castle claiming to terminate riscos ltds licence to develop sell and sub-license risc os  riscos ltd refuted all the claims made and challenged castle to identify how and from whom they had acquired risc os  an end to the dispute was signalled when riscos ltd and castle agreed to work on attempting to merge their development streams and re-unify risc os with castles engineers working on key system functionality and riscos ltd on user-facing elements one of the conditions was that riscos ltd agreed to be renamed risc os developments ltd rol and castle subsequently agreed to merge risc os  and risc os  together as of  this merge hasnt happened