Three recent legal rulings and their possible effects on high-tech business: The ruling on In re Bilski may limit the availability of patents on business methods and call into question the validity of the many business-method patents that the PTO has issued in the last decade; that on Perfect Web Technologies, Inc. v. InfoUSA, Inc., summarily invalidates a patent on improved techniques for sending "spam"; and that on Rembrandt Technologies, LP v. Harris Corp. holds that a patent essential to compliance with the HDTV standard adopted by the FCC is subject to reasonable and nondiscriminatory licensing because the original patent owner had given a RAND commitment to the Advanced Television System Committee (ATSC).