Evan Prodromou@Professor_Stevens @FediThing @hamishcampbell @aral@mastodon.ar.al the ActivityPub spec is patent-free. We had to forego any patent rights when we made the spec. Then, the hundreds of members of W3C, from companies to universities to governments, reviewed it and said they did not have, or would not enforce, patents on the protocol or it's approaches. One nice thing about implementing a standard from an official standards group is that it's as clean as you can get for patents.
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