Yes, there is no right for resting on your past achievements, there is arguably a fair way of getting advantages secured for a limited amount of time: innovatio

Yes, there is no right for resting on your past achievements, there is arguably a fair way of getting advantages secured for a limited amount of time: innovation, adding to others innovations, combining others works, opening new markets. And the other "unfair" way: patent-abuse, monopolies, cartels, copycats with no added value, lobbying for the gains of a few who are already better off. Some of that has been made illegal some of it just feels morally wrong. Basically it comes down to moral norms, which society can turn into laws if considered important enough by a majority. Its all comes down to finding a balance, economics will never be perfect or fair for all, but I consider it the goal of politics to be getting it closer to that ideal state which should be beneficial to all in the long run.