By purchasing one of the full versions of HelpNDoc, you are entitled for free updates for a full version cycle with a one year safety period. This means that, no matter what, you will benefit from one year of free updates. And if by the end of that year we haven't reached a full version cycle - for example if you buy version 6.0, a full version cycle will go up to version 7.0 included - you will still get free updates until that version cycle has been reached.