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Ask HN: Should I worry about software patents?

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Ask HN: Should I worry about software patents?

#1
A patent like this http://www.freepatentsonline.com/y2016/0342709.html is a straightforward way of persisting graph data on RDBMS. If I wish to create an open source alternate implementation of a GraphDB with similar design, should I be bothered? Can I get away with minor tweaks in the design?