But I always wondered what happens after the court case.
It's a good question, and usually depends on what the patent holder wants.
For example, Apple usually does NOT want to license their IP. Therefore the infringer of an Apple patent usually has to stop using it, and instead will often try to invent a workaround method. (That's what happened with slide to unlock and universal search.)
On the other hand, firms like Core exist to make money from licensing their patents, so they are quite willing to negotiate a continuing royalty. Sometimes the judge even sets it.
So again you often see the infringer invent a workaround... if they can. With something specific like 3G comm stuff, that might not be doable though. That's what makes such patents worth owning, even if they're FRAND, as paying for them is nearly impossible to avoid... versus glitzier patents that can be worked around or even simply not used.
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