On: A 25-year-old video patent just expired, ending a legal headache for Linux

[foobar1962]

That's confusing copyright with patents. The right to publish Newton's books is separate from being able to apply the knowledge which a patent protects. Note that math equations cannot be patented.

[anthk → foobar1962]

> Note that math equations cannot be patented.

RSA can if you equal factors to 0.