Whether a particular feature of a software invention is technical (=patentable) or not (=not patentable) really hinges on the individual case. Here’s a list of EPO case law that has clarified this question for some software-related features:
Cryptography – improving the level of trust in a digital certificate: technical but obvious
Cryptography – encrypting/decrypting messages and signing electronic messages: technical
Encrypted data communication: technical but obvious
Secure offline interactive gambling: technical and non-obvious
Rules for playing games: non-technical
Gaming – setting game parameters based on slide operations: non-technical
Logistics planning, statistical mathematics: non-technical
Optimizing marketing campaigns: non-technical
Mathematical methods: non-technical as such
Object-oriented information modelling reflecting the properties of a system: non-technical as such
Giving nicknames to business contacts: non-technical
Speeding up a computer algorithm: non-technical
Displaying status information about a device: technical but obvious (displaying operating faults of an escalator)
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