A closely watched appellate ruling invalidating broad software patents claims because they covered “unpatentable mental processes” isn’t as straightforward as it seems, Silicon Valley lawyers say.

The Federal Circuit U.S. Court of Appeals’ Aug. 16 ruling in CyberSource v. Retail Decisions, 2009-1358, leaves room for debate about what kinds of business methods can be patented, thanks to one word: practicality.

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