I was interested to read that there was a patent on 'non-round Compact Disks' but when you go to the actual patent application (https://patents.google.com/patent/US5844757) the patent states "...The present invention relates to a method and apparatus for reading and writing information on a stand alone magnetic card or disk typically adapted for use in standard three and one-half inch computer floppy disk drives." Note: I highlighted the magnetic part since Compact Disks are optical rather than magnetic. Not a patent lawyer but I'ld take my chances on not paying any royalty fees.I guess that's why these days patents tend to be so broad and use language like "any and all means (present and future) of doing thing 'X' "
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