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Magnetic disc cartridge and corresponding system/method for limiting copying of software

  • US 5,636,096 A
  • Filed: 10/02/1995
  • Issued: 06/03/1997
  • Est. Priority Date: 10/02/1995
  • Status: Expired due to Term
First Claim
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1. A magnetic disc cartridge rotatably housing a magnetic disc and including magnetic means for erasing software from the disc after the software has been copied a predetermined number of times, the magnetic disc cartridge comprising:

  • an upper housing portion;

    a lower housing portion affixed around its entire periphery in a non-pivotal manner to said upper housing portion;

    said magnetic disc sandwiched between said upper and lower housing portions;

    a sliding shutter mounted on at least one of said upper and lower housing portions, said shutter including sliding means for opening and closing a head insert opening defined in the cartridge upon insertion and removal of the cartridge into and from a computer respectively; and

    said magnetic means mounted on the cartridge for creating an erasing field proximate the disc after the software on the disc has been copied from the disc a predetermined number of times, said magnetic means also for erasing the software on the disc upon creation of said erasing field.

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