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Re:Judge wipes out patent troll’s $625M verdict against Apple by raverbashing on Wednesday August 03, 2016 @04:29AM (#12216493)
They don't search a patent database to build their own, but license a pre-existing (patented) solution.

You don't look at mp3s patents to build your own awkward version of a sound compression algorithm, you just use mp3

Re:Judge wipes out patent troll’s $625M verdict against Apple by Dylan16807 on Wednesday August 03, 2016 @05:30AM (#12216740)
If you'd rather license than build your own, copyright covers that fine. Patents only come into play when you are building your own.

And compression is really close to pure math to start with.