paying for service packs, security updates and bug fixes is crazy, HOWEVER it makes perfect sense to pay for a new version with new features. you are selling capabilities, instead of selling words.
there are a few valid models for this type of approach.
Operating systems, Office studios, Graphics software etc.
i believe that laser display software falls in to that category as long as new versions offer new features, not just new interfaces.
Since the Pangolin software is so closely married to the hardware, it may make allot of sense to start building hardware with a slightly more open (not to the public) architecture. Im talking about the hardware being upgraded using on-board flash programing that extends the capabilities of the hardware along with the software. Imagine an LD2000 with 2 gig of program storage and an Atom processor. \
microcharges have also been succesful, both in the world of updates and the world of content. obviously content takes the upper hand but there are software packages that give away big fixes (point release) and sell updates that add capabilities for a small amount (like plugins etc). Again, with this model you are selling the features not the entire package


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