[maxlybbert]

In the US, patents on ideas, business processes, and algorithms are not allowed. However, there's a goofy (court approved) legal idea that software transforms a general-purpose computer into a single-purpose computer, and that transformation makes software patentable.

The general-purpose computer to single-purpose computer transformation cracks me up (and makes it obvious that the law doesn't necessarily have any relationship with reality): "by loading this program, a computer able to do many different things becomes a computer capable of doing a specific thing."

[josaka]

>that transformation makes software patentable

This isn't true in many cases after the Supreme Court decision Alice v. CLS Bank in 2014. Now we have a rule more like that in Europe, where some software is patent-eligible if it's sufficiently technical (e.g., something like RSA, or better cache management) and not patent eligible if it's not technical (e.g, CRUD apps, or new views on a database).

[maxlybbert]

Thank you for the update. I wasn't aware of the Alice decision.

When I said "court approved" I meant Federal Circuit, as in Alappat ( https://en.wikipedia.org/wiki/In_re_Alappat#Majority_opinion ): "We have held that such programming creates a new machine, because a general purpose computer in effect becomes a special purpose computer once it is programmed to perform particular functions pursuant to instructions from program software."

On the one hand, several Supreme Court decisions appear to leave less room for software patents. On the other hand, I don't think the Supreme Court has an overall goal in mind. I believe the problem comes from the fact that the law prohibits patenting natural laws, but allows patenting the application of natural laws. It's hard to distinguish between those two ideas; and I believe impossible to distinguish between them when it comes to software.