SECURITY DEVICE

Abstract: This application describes a means for inhibiting the theft of an electronic device. The electronic device generally comprises a processor unit and a display device for displaying operational output from the processor unit, and the invention resides in including within the electronic device a receiver unit adapted to receive remotely transmitted signals and capable of causing the processor unit to at least partially obscure or change the output on the display device after such a signal has been received. The electronic device can be any device that produces a visible output. In preferred forms of the invention, the obscuring of the display output is by overprinting a message informing you that the device is stolen, and more preferred versions include a unique identification code in that message. This enables the authorities to identify the true owner of the article. The receiver unit can be the receiver of a radio pager, for example. Thus, on noticing the theft of the device the owner alerts a service provider who activates the receiver unit.

Description: Security Device The present invention relates to a security device, especially one intended for use in protecting electronic devices. Computers are used routinely in a very large number of businesses and homes. The decrease in the cost of computing power has fuelled this expansion, and at the same time advances in micro electronics have meant that the physical size and weight of a powerful computer has decreased to the point where even a desk top computer can be carried relatively easily. This has meant that the theft of personal computers, in particular laptop computers, have become extremely easy and is now a serious problem. It is estimated that one quarter of all commercial computer users in the United Kingdom have been burgled or robbed of at least some of their computer stock. The value of this equipment stolen in 1994 was over £100 million. One dealer has estimated that 35% of his customers have been robbed; 25% of those have been robbed more than once, some as much as six or seven times. The ease with which such thefts can be executed is illustrated by one example in which thieves entered the premises of a company at 9.57pm and in the following four minutes before the arrival of the police stole £15,000 worth of equipment. Once a computer is stolen, the hard disk can be re¬ formatted and the computer can then be sold easily. It is estimated that one particular case reaped £3 million for the burglar. Insurance companies who provide insurance against computer burglary now find that computer theft is dominating their time and causing severe losses. Often, insurance premiums increase significantly after a theft has taken place, or insurance is refused altogether. Insurers may often insist on improving security at business premises; the cost of this can be as much as £6,000. Methods exist to protect computers against theft; these include physical means such as attaching security tags firmly to the computers or defacing the exterior surface of the computer to dissuade potential purchasers of the stolen goods; both of these are unsightly and the former is liable to incite damage of the computer by the thief in an attempt to remove it. Computers can be provided with password locks, which ensure that the computer will not operate until the correct password is entered. However re-formatting of the hard disk is usually possible and this will erase all software present, including the password lock. US 5355414 discloses a system whereby the peripheral devices (e.g. the display unit and keyboard) are disabled for a predetermined period of time if an incorrect password is entered. However, this is a software-based system and therefore inherently vulnerable. US 5343524 discloses a computer with an additional microprocessor which must be present in order to allow the system to operate. The contents of the microprocessor are said to be non-copyable. If the microprocessor is removed, then the computer will not operate. However, should the system be stolen, the thieves will presumably also take the microprocessor. There therefore exists a need for a means for dissuading or preventing theft of computers and the like, at a cost which is ideally less than the cost of insuring the equipment. The present invention therefore provides an electronic device comprising a processor unit and a display device for displaying operational output from the processor unit; the device including a receiver unit adapted to receive remotely transmitted signals and capable of causing the processor unit to at least partially obscure or change the output on the display device after such a signal has been received. Preferably, the obscuring is by overprinting a message on top of the normal operational output. It may, of course be by replacing that ordinary operational output with a message, or the like. Preferably, the receiver unit also causes the display of an identification code stored in the receiver unit. This will preferably be unique to that piece of equipment and will enable identification of the true owner. Preferably, the receiver unit includes a power source distinct from that of the processor unit thereby to enable continuous monitoring for incoming signals. Those types of equipment which include a screen display can operate by obscuring the normal display of that screen. Those items of equipment which produce output in printed form can operate by superimposing a message on a printed output, or by replacing the output with the message. For example the electronic device can include computers, televisions, facsimile machines, photocopiers, video recorders, visual projection systems, or printers or any device capable of the above. The receiver unit and remotely transmitted signals can be implemented by using similar technology to that employed by radio paging systems. This is an established remote signalling system in which a telephone call to the correct number (placed anywhere in the country) causes a signal to be sent to a portable receiver unit which is then activated. Such technology is well known and would need only simple modification to suit the present invention. The present invention also relates to an upgrade kit, especially for installation in computers, which comprises the receiver device as defined above in conjunction with means for connecting the receiver unit with the remainder of the electronic device. The present invention also relates to a method of decreasing the value of a stolen electronic device, comprising providing within the device prior to theft thereof a receiver unit for receiving remotely transmitted signals, the receiver unit being adapted to obscure or change the visual output of the electronic device on being activated by a remotely transmitted signal; wherein on loss or theft of the device, a signal is sent to the receiver unit to activate it. Finally, the present invention relates to a method of inhibiting the theft of an electronic device, comprising the steps of providing within the device a receiver unit for receiving remotely transmitted signals, the receiver unit being adapted to obscure or change the visual output of the electronic device on being activated by a remotely transmitted signal; and providing on the device or in the vicinity of the device visible indicia indicating the presence within the device of the said receiver unit. These methods can be applied to, for example, the above-described electronic devices in the manner described. An embodiment of the present invention will now be described by way of example, with reference to the accompanying Figures in which:- Figure 1 is a perspective view of a computer incorporating the system; Figure 2 is a view of a screen of a computer prior to activation of the system; Figure 3 is a view of a screen of a computer after activation of the system; Figure 4 is a flow chart showing the steps in the system; Figure 5 shows the internal operation of the system in more detail. Figure 1 shows on otherwise conventional personal computer 10 which has additional card 12 fitted to its mother board. That mother board comprises a receiver unit generally similar to that employed in a radio paging device. That is to say, it is adapted to listen on a particular radio frequency for signals sent by a central transmitter, and on receiving a signal identifies whether the signal contains a code unique to that receiver unit. If so, the output of the receiver unit is activated. Also present on the card 12 is a rechargeable battery independent of the main power source of the personal computer but adapted to recharge itself therefrom. Thus, the receiver unit of card 12 is able to listen on its allocated frequency continuously. Also present on the card 12 is a signal processor for handling the signal produced by the PC 10 for onward transmission to a display unit 14. When an activation signal is received by the signal processor from the receiver unit, the signal processor from then onwards until reset superimposes on the normal output of the PC 10 a predetermined message. That message is, in this embodiment, large enough and prominent enough to obscure most of the normal output of PC 10. Figure 2 shows the normal output of a personal computer. This PC is running under the Windows™ operating system and therefore is dependent on a graphical output for its operation. Windows™ is a Trade Mark of Microsoft Corporation. Figure 3 shows the same screen immediately after activation of the card 12. A message is clearly and prominently displayed on top of the normal output shown in Figure 2 and it is clear that the operation of this computer is significantly inhibited. Its value as a second-hand sale is therefore very low. The displayed message also includes a code number 16 in the corner of the screen. That code number is unique to the signal processor within the card 12 and therefore should the computer 10 be retrieved by the police then this number can be used to identify the true owner. Figure 4 shows the steps in the operation of the system. A customer purchases a computer 10, in this case a laptop, which is fitted with the system according to the invention, here designated by the Trade Mark ACCUPAGE. The customer contacts the system provider who arranges an airtime subscription to a paging service sub-let from the relevant telecommunications provider, in this case British Telecom. Then an identification file is created for that customer and an identification number 16 stored in that computer is logged. It is of course to be hoped that this particular customer never proceeds further along this flow chart. However, should the computer be stolen (box 18), then the customer can call the service provider and identify their stock that has been stolen. The service provider then identifies (from the identification file previously created) the electronic addresses of the receiver units within the stolen computer 10, and sends a signal to activate those receiver units. This is then received by the receiver units, and the message appears on the screen, step 20. The thief is then likely to abandon the stock, whereupon it should fall into the hands of the police who can use the identification code 16 to return the equipment to its rightful owner. Figure 5 shows some of the internal construction of the card 12. It can be seen that a receiver unit 22 provides a received signal to a decoder 24 which considers the signal and if appropriate to that computer 10 triggers the superimposition of a message by the signal processor 26. It will be appreciated that the above described example is by way of illustration only and many variations are possible whilst remaining within the scope of the present invention.

Claims: CLAIMS 1. An electronic device comprising a processor unit and a display device for displaying operational output from the processor unit; the device including a receiver unit adapted to receive remotely transmitted signals and capable of causing the processor unit to at least partially obscure or change the output on the display device after such a signal has been received. 2. An electronic device according to claim 1 wherein the obscuring is by overprinting a message on top of the normal operational output. 3. An electronic device according to claim 1 wherein the obscuring is by replacing the ordinary operational output with a message, or the like. 4. An electronic device according to any preceding claim wherein the receiver unit is also capable of causing the display of an identification code stored in the receiver unit. 5. An electronic device according to claim 4 wherein the identification code is unique to that piece of equipment thereby to enable identification of the true owner. 6. An electronic device according to any preceding claim wherein the receiver unit includes a power source distinct from that of the processor unit thereby to enable continuous monitoring for incoming signals. 7. An electronic device according to any preceding claim wherein the display device is a screen display, wherein the receiver unit causes the normal display of that screen to be obscured. 8. An electronic device according to any one of claims 1 to 6 wherein the display device produces output in printed form, and in which the receiver unit causes a message to be superimposed on the printed output. 9. An electronic device according to any preceding claim being one of a computer, television, facsimile machine, photocopier, video recorder, visual projection system, or printer. 10. An upgrade kit, especially for installation in computers, which comprises the receiver device as defined in any preceding claim in conjunction with means for connecting the receiver unit with the remainder of the electronic device. 11. A method of decreasing the value of a stolen electronic device, comprising providing within the device prior to theft thereof a receiver unit for receiving remotely transmitted signals, the receiver unit being adapted to obscure or change the visual output of the electronic device on being activated by a remotely transmitted signal; wherein on loss or theft of the device, a signal is sent to the receiver unit to activate it. 12. A method of inhibiting the theft of an electronic device, comprising the steps of providing within the device a receiver unit for receiving remotely transmitted signals, the receiver unit being adapted to obscure or change the visual output of the electronic device on being activated by a remotely transmitted signal; and providing on the device or in the vicinity of the device visible indicia indicating the presence within the device of the said receiver unit. 13. An anti-theft device substantially as herein described with reference to the accompanying figures.

Inventors: MCCARTHY SHAUN, MCCARTHY, SHAUN
Applicants: ACCUPAGE LTD, MCCARTHY SHAUN, ACCUPAGE LIMITED, MCCARTHY, SHAUN
Application year: 1996
Main classification: G08B25
IPC codes: G06F1, G06F13, G06F21, G08B5, G08B13, G08B25