Method and system of granting access to a property to a user

Abstract

A computer implemented method of granting access to a property 305 to a user includes receiving a first signal 615 from a first user device 315 within a receiving range of a secured access point of th

Description

Technical Field The present invention relates to methods and systems of granting access to a property to a user and enhances the security of accessing the property. Background Many physical properties like a vehicle, a building, a home, and a storage unit can be locked and unlocked remotely by a user with a user device like a key fob. As an example, vehicles especially cars are commonly provided with a key fob 315 (or any similar device) that can lock and unlock the vehicle remotely from a distance. FIG. 3 shows a schematic of a locked vehicle 305 that can be locked and unlocked with a key fob 315. With such systems, the vehicle 305 may have a communication zone 325 where it can receive signals from the key fob 315 that are generated manually by the user. Some vehicles may have a passive system where the locked vehicle 305 can be unlocked to the unlocked vehicle 310 and / or remain unlocked if the key fob 315 is detected within the unlocking zone 320. US 2022 / 0172536 describes systems and techniques for a physical access control systems with localization-based intent detection. The access control system regulates access to an asset by receiving a credential from a key device associated with a user using a first wireless connection, verifying the credential with a preliminary authentication for the asset, establishing a second wireless connection with the key device in response to verifying the credential with the preliminary authentication, determining an intent of the user to access the asset, identifying the credential includes a pattern in the preliminary authentication, and providing a command to grant access to the asset. Summary In a first aspect, there is provided a computer implemented method of granting access to a property to a user. The method comprises receiving a first signal from a first user device within a receiving range of a secured access point of the property; determining, by the secured access point, authenticity of the first signal; if the first signal is authentic, generating and transmitting a second signal, by the secured access point, to a second user device different from the first user device, the second signal requests for authorisation to grant access to the property to the user. The term “signal” herein refers to an electrical signal and may be used for storing, transmitting, and exchanging information. Preferably, the method further comprises receiving a third signal from the second user device, the third signal grants or denies access to the property. Preferably, if the third signal grants access to the property the method further comprises sending a fourth signal to unlock a door of the property. Preferably, if the third signal denies access to the property the method further comprises sending a fifth signal to the second user device that access to the property has been denied. In a second aspect, there is provided a computer implemented method of granting access to a property to a use. The method comprises receiving a second signal from a secured access point, wherein the secured access point receives a first signal from a first user device within a receiving range of the secured access point of the property; determines the first signal is authentic; generates and transmits the second signal to request for authorisation to grant access to the property to the user. Preferably, the method further comprises generating a request to grant or deny access to the property; receiving a response to grant or deny access to the property; and sending a third signal to the secured access point to grant or deny access to the property. Preferably, if the third signal denies access to the property, the method further comprises receiving a fifth signal from the secured access point that access to the property has been denied. Preferably, the request to grant or deny access to the property is by at least one of the following: biometric verification, dual authentication, a code, a mobile application authorization, voice recognition, and a security token. In a third aspect there is provided a computer-readable medium or a computer program comprising instructions which, when executed by a computer, cause the computer to carry out the method according to the first aspect or the second aspect. In a fourth aspect, there is provided a system for granting access to a property to a user, the system comprises a processor; a transmitter; and a computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the method according to the first aspect or the second aspect. The system comprises a processor; a transmitter configured to receive a first signal from a first user device within a receiving range of the transmitter and transmit a second signal to a second user device different from the first user device; and a computer-readable medium comprising instructions which, when executed by the processor, cause the processor to determine authenticity of the first signal and if the first signal is authentic, generate the second signal to request for authorisation to grant access to the property to the user. Preferably, the transmitter is configured to receive a third signal from the second user device, the third signal grants or denies access to the property. Preferably, if the third signal grants access to the property, the processor sends a fourth signal to unlock a door of the property; and wherein if the third signal denies access to the property, the processor generates a fifth signal that is send by the transmitter to the second user device that access to the property has been denied. In an embodiment, the property is selected from the group consisting of a vehicle, a building, a home, and a storage unit. In an embodiment, the first user device is a key fob and the second user device is a pre-enrolled device. Description of Figures Figure (FIG.) 1 shows a flowchart of an embodiment of the invention. FIG. 2 shows a flowchart of another embodiment of the invention. FIG. 3 shows a schematic of a remote keyless entry system of a vehicle. FIG. 4 shows a schematic of a manual remote keyless entry system of a vehicle. FIG. 5 shows a schematic of a passive remote keyless entry system of a vehicle. FIG. 6 shows a schematic of an enhanced passive remote keyless entry system of a vehicle. FIG. 7 shows a flowchart of an enhanced passive remote keyless entry system of a vehicle. Detailed Description The following detailed description is merely exemplary in nature and is not intended to limit the invention or the application and uses of the invention. Furthermore, there is no intention to be bound by any theory presented in the preceding background of the invention or the following detailed description. Other technical advantages may become readily apparent to one of ordinary skill in the art after review of the following figures and description. Features that are described in the context of an embodiment may correspondingly be applicable to the same or similar features in the other embodiments. Features that are described in the context of an embodiment may correspondingly be applicable to the other embodiments, even if not explicitly described in these other embodiments. Furthermore, additions and / or combinations and / or alternatives as described for a feature in the context of an embodiment may correspondingly be applicable to the same or similar feature in the other embodiments. Modifications, additions, or omissions may be made to the systems, apparatuses, and methods described herein without departing from the scope of the disclosure. For example, the components of the systems and apparatuses may be integrated or separated. Moreover, the operations of the systems and apparatuses disclosed herein may be performed by more, fewer, or other components and the methods described may include more, fewer, or other steps. Additionally, steps may be performed in any suitable order. As used in this document, “each” refers to each member of a set or each member of a subset of a set. The phrase “at least one of A and B” means it requires only A alone, B alone, or A and B, i.e. only one of A or B is required. Where a combination is disclosed, each subcombination of the elements of that combination is also specifically disclosed and is within the scope of the invention. Conversely, where different elements or groups of elements are disclosed, combinations thereof are also disclosed. Where any element of an invention is disclosed as having a plurality of alternatives, examples of that invention in which each alternative is excluded singly or in any combination with the other alternatives are also hereby disclosed; more than one element of an invention can have such exclusions, and all combinations of elements having such exclusions are hereby disclosed. Ultra-Wideband (UWB) technology is a wireless communication protocol that utilises a wide range of frequencies to transmit data over short distances with high precision. When integrated into keyless entry systems, UWB enables more accurate and secure detection of the key fob's 315 proximity to the vehicle, enhancing the passive access functionality. FIG. 4 shows an example of an existing manual remote keyless entry (RKE) system and a manual remote unlocking method 400. The owner of the locked vehicle 305 approaches the vehicle and manually presses the unlock button or function 410 on the key fob 315 which generates and sends an unlocking signal using a transreciver in the key fob 315 to send a coded radio signal via secure signal transmission 415 to the RKE receiver of the locked vehicle 305. When the key fob 315 is within the communication zone 325 of the locked vehicle 305, the coded radio signal is caught by the RKE receiver antenna and funnelled to the vehicle’s control module where it gets deciphered into specific commands. Depending on whether the received command was to unlock or lock, the control module triggers corresponding door-lock actuators, causing them to engage door locks into opening or closing actions. After completion of these operations, the vehicle 305 / 310 may give auditory and / or visual feedback (like a honk or blink of headlights) to confirm successful receipt and execution of the operation. Hence, the locked vehicle 305 receives and interprets the unlocking signal (step 420) from the key fob 315. The locked vehicle 305 authenticates the unlocking signal and if valid executes a command to unlock the doors of the vehicle (step 430) to provide the unlocked vehicle 310. The locking mechanism of the key fob 315 generally operates in the same manner. The key fob 315 may provide other functions to remotely control the vehicle’s operations, for example to open the trunk of the locked vehicle 305 and to start the vehicle engine. FIG. 5 shows an example of an existing passive remote keyless entry system. The key fob 315 and the vehicle 305, 310 are equipped with UWB transceivers that communicate with each other using ultra-wideband radio waves. Unlike traditional keyless entry systems that rely on proximity-based signals like Bluetooth or RFID, UWB offers higher precision and accuracy in determining the distance between the key fob 315 and the vehicle 305, 310. UWB enables secure authentication between the key fob 315 and the vehicle's onboard system. Each key fob is uniquely identified and authenticated by the vehicle's UWB receiver, ensuring that only authorized key fobs 315 can interact with the vehicle 305, 310. With UWB technology, the vehicle 305, 310 can detect the presence of an authorized key fob 315 even when it is in close proximity to the vehicle (within the unlocking zone 320 of the vehicle 305, 310, without the need for the driver to actively press a button or touch the door handle. This enables a seamless and convenient "passive access" experience, where the doors automatically unlock as the driver approaches the vehicle 305, 310. UWB's precise localization capabilities reduce the risk of unauthorised access or relay attacks, where thieves intercept and amplify the key fob's 315 signal to gain entry to the vehicle 305. The high accuracy of UWB helps prevent such attacks by ensuring that the key fob is within a very close range of the vehicle 305 before unlocking the doors. UWB-based keyless entry systems offer customisation options to adjust the sensitivity and range of the passive access feature according to the driver's preferences and security requirements. This allows for a tailored user experience while maintaining a high level of security. Overall, the integration of UWB technology into keyless entry systems enhances the security, accuracy, and convenience of passive access functionality, providing drivers with a seamless and reliable experience while protecting against unauthorized access and theft. In FIG. 5, as the user holding the key fob 315 approaches the locked vehicle 305 and gets within the unlocking zone 320 of the locked vehicle 305 (step 505), the locked vehicle 305 automatically detects the key fob 315 and activates the transmitter (step 510) with secured signal transmission 515 between the key fob 315 and the vehicle 305. The locked vehicle 305 receives and interprets the unlocking signal (step 520) from the key fob 315. The locked vehicle 305 authenticates the unlocking signal and if valid executes a command to unlock the doors of the vehicle (step 530) to provide the unlocked vehicle 310. The passive remote keyless entry system may be used in tandem with the manual remote keyless entry system. A problem with the manual and passive RKE systems in FIG. 4 and FIG. 5 is that if a third party (i.e. an unintended user) obtains the key fob 315, for example by stealing from the rightful user or finding a dropped key fob 315, the third party can illegally obtain access to the property, like the locked vehicle 305, with the key fob 315. For example, the third party may manually repeatedly press the unlock button on the key fob 315 until it is within the communication zone 325 of the locked vehicle 305 or walk between vehicles until they key fob 315 is within the unlocking zone 320 for a locked vehicle 305 with a passive RKE system to locate and access the vehicle 305. Either way the third party can access the vehicle without the owner’s permission. Existing manual and passive RKE systems do not have the technical means to ascertain if the user holding the key fob is the intended user and does indeed have the right to access the vehicle. A solution is described herein to enhance the security for manual and passive RKE systems to prevent an unintended user gaining access to the vehicle or property 305 in general. In particular, the solution prevents an unintended user from gaining access to the secured access point or access-controlled area of the vehicle 305 through a valid key fob 315 (or transponder) and to prevent unauthorised access to the property 305. FIG. 1 shows a flowchart outlining an embodiment of a computer implemented method 100 of granting access to a property to a user. FIG. 1 shows the method as it will be performed by a processor at the secured access point. At block 105, a first signal is received from a first user device 315 (which is exemplified by the key fob) within a receiving range of a secured access point of the property. At block 110, the secured access point determines the authenticity of the first signal. At block 115, if the first signal is authentic, the secured access point generates and transmits a second signal to a second user device 350. The transmission is via the Network Access Device. The second user device is a pre-enrolled authenticated trusted device 350. The second signal requests for authorisation to grant access to the property to the user. The authorised user then grants or denies access at the pre-enrolled authenticated trusted device 350 which then sends a third signal back to the secured access point. At block 120, the secured access point receives the third signal from the second user device 350 and grants or denies access to the property. If access is granted, the secured access point sends a fourth signal to unlock a door of the property at block 125. Depending on the property there may be more than one door. The access rights to the property may be configured such that when access is granted only one door is opened, a subset of doors is opened, or all doors of the property are opened. The property may be a vehicle, a building, a home, or a storage unit. The method 100 works with manual and / or passive RKE systems. This method is generally more applicable to a locked property 305 as its purpose is to prevent unintended access to the locked property 305 and is less relevant to locking the unlocked property 310. FIG. 2 shows a flowchart outlining an embodiment of a computer implemented method 200 of granting access to a property 305 to a user as performed on the pre-enrolled authenticated trusted device 350 (i.e. the second user device). At block 205, the second user device 350 receives a second signal from the secured access point requesting for authorisation to grant access to the property to the user. At block 210, the second user device 350 generates a request to grant or deny access to the property 305 and is displayed to the user. The user selects to grant or deny access to the property 305. At block 215, the second user device 350 receives the response to grant or deny access to the property 305 and at block 220 sends a third signal corresponding to the received response in block 215. If access to the property 305 is denied, the secured access point may send a fifth signal to the second user device that access to the property 305 has been denied as in block 225. The key fob 315 (may be termed Keyless Entry device) transmits the unlocking signal to gain access to the secured access point (may also be termed access-controlled area). The secured access point determines the authenticity of the received unlocking signal. The secured access point generates a new signal via the Network Access Device (NAD) and sends it to the authenticated trusted device 350 which is pre-enrolled by the authorised user (e.g. owner of the vehicle or property) to request to grant access to the secured access point. The new signal may be a control signal based on 5G NR (New Radio), Wi-Fi, narrowband Internet of things (NB-loT), or any other similar wireless communication technology. The authorised user may then grant the access or deny the access. Alternatively, if the secure access point determines that the unlocking signal is invalid, it generates an ALERT signal to the pre enrolled authenticated trusted device. The ALERT signal may be a response signal in the form of a SOS response, a text message, a PUSH messages or any other similar response message. The embodiments described herein are provided with detail based on a vehicle but may be applied to encompass non-limiting examples of secured access points, such as vehicles, buildings, rooms, storage units, where entry is restricted and controlled through electronic means like keyless entry systems. The authenticated trusted device may be a mobile device like a mobile phone, tablet, laptop, computer, an application, or a token. A mobile phone application would be the most convenient option as most users would have a mobile device or tablet that can download the application. The authentication for keyless access system can be one or many of the authentication methods such as but not limited to Biometric Verification, Dual Authentication, PIN Code, Smartphone App Authorization, Voice Recognition, and Security Token FIG. 6 shows a schematic of an embodiment of the invention with a passive RKE system. The enhanced method 600 requires the key fob 315 to be within range (i.e. inside the unlocking zone 320). The locked vehicle 305 automatically detects the key fob 315 using the UWB and activates the vehicle’s transmitter (step 610). Communications between the key fob 315 and the locked vehicle 305 is performed via secure signal transmissions 615 and also between the locked vehicle 305 and the authenticated trusted device 350 (secure signal transmissions 620). In step 625, the secured access point (or control module) of the locked vehicle 305 receives and interprets the unlocking signal from the key fob 315. An authentication signal is generated and sent to a pre-enrolled authenticated trusted device 350 (step 630) via secure signal transmission 620. The authorised user can then grant or deny access on the pre-enrolled authenticated trusted device 350 (step 635). The grant or denial of access is then sent back to the secured access point. If access has been granted, the secured access point executes a command to unlock the door of the locked vehicle (305) (step 640). If access is denied, the secured access point does not unlock the door of the locked vehicle 305. FIG. 7 shows a flowchart of the enhanced method 700 with a manual and passive RKE system. At block 705, the key fob 315 is within the range of the vehicle’s transreceiver. At block 710, it is determined whether passive access is enabled. If passive access is enabled, the UWB Reader (or receiver) automatically detects the key fob 315 using UWB and activates the vehicle’s transmitter and proceeds to block 725. If passive access is not enabled, the process moves to block 720 where the user manually presses the unlock button on the key fob 315 to generate a coded radio signal which is sent to the vehicle’s receiver and proceed to block 725. At block 725, secure signal transmission between the secured access point and the key fob 315 takes place to request to unlock the locked vehicle 305. At block 730, the secured access point determines the authenticity of the received unlocking signal. At block 735, the secured access point generates a new signal and sends it via the Network Access Device (NAD) to the pre-enrolled authenticated trusted device 350. The new signal requests for the authorised user to grant or deny access to the locked vehicle. The UWB reader and the secured access point may be an integral component or separate components. Block 740 is based on the user input to the request to grant or deny access. In an embodiment, block 740 may be performed by the secured access point. If the authorised user grants access, the process moves to block 745 and a grant access signal is sent to unlock the door of the locked vehicle 305 (for example by sending a command to the actuators of the door lock to unlock). If the authorised user denies access, the process moves to block 750 where an Alert signal is generated and sent to the pre-enrolled authenticated trust device 350. This notifies the user of an untrusted security breach. At block 755 a signal to deny access may be sent to ignore the unlock command from the key fob 315. In an embodiment, block 740 may be performed at the pre-enrolled authenticated trust device 350. If the authorised user grants access, the process moves to block 745 and a grant access signal is sent back to the secured access point which subsequently execute a command to unlock the door of the locked vehicle 305 (for example by sending a command to the actuators of the door lock to unlock). If the authorised user denies access, the process moves to block 750 where an Alert signal is generated and sent to the pre-enrolled authenticated trust device. This notifies the user of an untrusted security breach. At block 755 a signal to deny access is sent back to the secured access point which does not unlock the door of the locked vehicle 305. The systems and methods described above may be implemented in many different ways in many different combinations of hardware, software, firmware, or any combination thereof. In one example, the systems and methods may be implemented with a computer having a processor and a memory communicably coupled thereto, where the memory stores instructions, which when executed by the processor, cause the processor to perform the aforementioned methods. The processor may include any type of circuit such as, but not limited to, a microprocessor, a microcontroller, a graphics processor, a digital signal processor, or another processor. The processor may also be implemented with discrete logic or components, or a combination of other types of analogue or digital circuitry, combined on a single integrated circuit or distributed among multiple integrated circuits. All or part of the logic described above may be implemented as instructions for execution by the processor, controller, or other processing device and may be stored in a tangible or non-transitory machine-readable or computer-readable medium such as flash memory, random access memory (RAM) or read only memory (ROM), erasable programmable read only memory (EPROM) or other machine-readable medium such as a compact disc read only memory (CDROM), or magnetic or optical disk. A product, such as a computer program product, may include a storage medium and computer readable instructions stored on the medium, which when executed in an endpoint, computer system, or other device, cause the device to perform operations according to any of the description above. The memory can be implemented with one or more hard drives, and / or one or more drives that handle removable media, such as diskettes, compact disks (CDs), digital video disks (DVDs), flash memory keys, and other removable media. The systems and methods can also include a display device, an audio output, and a controller, such as a keyboard, mouse, trackball, game controller, microphone, voice-recognition device, or any other device that inputs information. The processing capability of the system may be distributed among multiple system components, such as among multiple processors and memories, optionally including multiple distributed processing systems. Parameters, databases, and other data structures may be separately stored and managed, may be incorporated into a single memory or database, may be logically and physically organized in many different ways, and may implemented in many ways, including data structures such as linked lists, hash tables, or implicit storage mechanisms. Programs may be parts (e.g., subroutines) of a single program, separate programs, distributed across several memories and processors, or implemented in many different ways, such as in a library, such as a shared library (e.g., a dynamic link library (DLL)). The DLL, for example, may store code that performs any of the system processing described above. The systems and methods can be implemented over a cloud. In some embodiments, a hardware module may be implemented mechanically, electronically, or any suitable combination thereof. For example, a hardware module may include dedicated circuitry or logic that is permanently configured to perform certain operations. For example, a hardware module may be a specialpurpose processor, such as a field programmable gate array (FPGA) or an ASIC. A hardware module may also include programmable logic or circuitry that is temporarily configured by software to perform certain operations. For example, a hardware module may include software encompassed within a general-purpose processor or other programmable processor. It will be appreciated that the decision to implement a hardware module mechanically, in dedicated and permanently configured circuitry, or in temporarily configured circuitry (e.g., configured by software) may be driven by cost and time considerations. Reference Signs 100-FIG. 1 Flowchart 105 - Flowchart step 110- Flowchart step 115- Flowchart step 120 - Flowchart step 125 - Flowchart step 130 - Flowchart step 200 - FIG. 2 Flowchart 205 - Flowchart step 210 - Flowchart step 215 - Flowchart step 220 - Flowchart step 225 - Flowchart step 305 - Locked property I Locked vehicle 310 - Unlocked property I Unlocked vehicle 315 - First user device I Key fob 320 - Unlocking zone 325 - Communication zone 350 - Second user device I Pre-enrolled authenticated trusted device 400 - Manual remote unlocking method 405 - Key fob within communication zone 410 - Step of generating unlock signal from key fob 415 - Secure signal transmission between key fob and vehicle 420 - Step of receiving and interpreting received signal from key fob 430 - upon successful key fob authentication, step of executing a command to unlock door 500 - passive remote unlocking method 505 - Key fob within unlocking zone 510 - Step of detecting the key fob using UWB and activating the transmitter 515 - Secure signal transmission between key fob and vehicle 520 - Step of receiving and interpreting received signal from key fob 530 - upon successful key fob authentication, step of executing a command to unlock door 600 - Enhanced remote unlocking method 605 - Key fob within unlocking zone 610 - Step of detecting the key fob using UWB and activating the transmitter 615 - Secure signal transmission between key fob and vehicle 620 - Secure signal transmission between vehicle and mobile device 625 - Step of receiving and interpreting received signal from key fob 630 - Step of generating an authentication signal 635 - Step of granting or denying access 640 - upon successful key fob authentication, step of executing a command to unlock door 700 - Flowchart of enhanced remote unlocking method 705 - Flowchart step 710 - Flowchart decision 715 - Flowchart step 720 - Flowchart step 725 - Flowchart step 5 730 - Flowchart step 735 - Flowchart step 740 - Flowchart decision 745 - Flowchart step 750 - Flowchart step 10 755 - Flowchart step

Claims

1. A computer implemented method (100) of granting access to a property (305) to a user, the method (100) comprisingreceiving a first signal from a first user device (315) within a receiving range of a secured access point of the property (305);determining, by the secured access point, authenticity of the first signal;characterised in thatif the first signal is authentic, generating and transmitting a second signal, by the secured access point, to a second user device (350) different from the first user device (315), the second signal requests for authorisation to grant access to the property (305) to the user.

2. The computer implemented method (100) according to claim 1 further comprising receiving a third signal from the second user device (350), the third signal grants or denies access to the property (305).

3. The computer implemented method (100) according to claim 2, wherein if the third signal grants access to the property (305) the method further comprises sending a fourth signal to unlock a door of the property (305).

4. The computer implemented method (100) according to claim 2, wherein if the third signal denies access to the property (305) the method further comprises sending a fifth signal to the second user device (350) that access to the property (305) has been denied.

5. A computer implemented method (200) of granting access to a property (305) to a user, characterised in that the method (200) comprisingreceiving a second signal from a secured access point, wherein the secured access point receives a first signal from a first user device (315) within a receiving range of the secured access point of the property (305); determines the first signal is authentic; generates and transmits the second signal to request for authorisation to grant access to the property (305) to the user.

6. The computer implemented method (200) according to claim 5, the method further comprising generating a request to grant or deny access to the property (305); receiving a response to grant or deny access to the property (305); and sending a third signal to the secured access point to grant or deny access to the property (305).

7. The computer implemented method (200) according to claim 6, wherein if the third signal denies access to the property (300), the method further comprises receiving a fifth signal from the secured access point that access to the property (305) has been denied.

8. The computer implemented method (200) according to claim 6 or claim 7, wherein the request to grant or deny access to the property is by at least one of the following: biometric verification, dual authentication, a code, a mobile application authorization, voice recognition, and a security token.

9. The computer implemented method (100, 200) according to any one of claims 1 to 8, wherein the property is selected from the group consisting of a vehicle, a building, a home, and a storage unit.

10. The computer implemented method (100, 200) according to any one of claims 1 to 9, wherein the first user device is a key fob and the second user device is a pre-enrolled device.

11. A computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the method (100, 200) according to any one of claims 1 to 10.

12. A system for granting access to a property (305) to a user, the system comprisinga processor;a transmitter; andthe computer-readable medium according to claim 11.

13. A system for granting access to a property (305) to a user, the system comprisinga processor;a transmitter configured to receive a first signal from a first user device (315) within a receiving range of the transmitter and transmit a second signal to a second user device (350) different from the first user device (315); and characterised in thata computer-readable medium comprising instructions which, when executed by the processor, cause the processor to determine authenticity of the first signal and if the first signal is authentic, generate the second signal to request for authorisation to grant access to the property (305) to the user.

14. The system according to claim 13, wherein the transmitter is configured to receive a third signal from the second user device (350), the third signal grants or denies access to the property (305).

15. The system according to claim 14, wherein if the third signal grants access to the property (305), the processor sends a fourth signal to unlock a door of the property (305); and wherein if the third signal denies access to the property (305), the processor generates a fifth signal that is send by the transmitter to the second user device (350) that access to the property (305) has been denied.

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