Method for managing the function usage of a watch

Abstract

The present invention relates to a method for managing the use of functions of a watch (100), the method comprising: - a step (10) of authenticating the wearer of the watch (100) in order to authorize access to said functions, and - a step (12) of controlling the identity of the wearer of the watch during a determined period by verifying the validity of a digital identification element determined from at least one biometric information element of the wearer, and - a step (24) of unlocking access to the functions of the watch (100) when the access is locked, said step comprising the following sub-steps: · presenting (25) a graphical representation (41) on an interface (3) for broadcasting visual information of the watch (100); · selecting (28) within a limited time interval a sequence of at least two identification parts included in the graphical representation (41) intended to identify the wearer, said sequence corresponding to the identification code of the wearer, and · verifying (30) the selected sequence.

Description

Technical Field

[0001] The present invention relates to a method for managing the use of functions of a watch and to a system for implementing such a method.

[0002] The present invention also relates to a watch comprising such a system and a computer program. Background Art

[0003] A watch includes a set of functions that can be used by a wearer. In addition to setting the time or date, such functions may also involve the use of confidential or private data specific to the wearer and that can be used to access personalized services. Such data are, for example, keys, certificates, authentication codes, passwords, and personal codes that allow the watch to establish a secure connection with a private corporate network, authenticate with a secure server such as a bank server, or be used for secure messaging for sending and receiving signed and / or encrypted emails. Thus, it can be understood that it is important to be able to securely access the use of such functions of the watch.

[0004] For this purpose, methods known in the prior art manage the use of functions of a watch by strengthening the authentication criteria for authorizing / prohibiting such use, for example, by implementing additional authentication steps.

[0005] However, one of the main drawbacks of such a method is related to the fact that once the wearer of the watch is authenticated, any individual can access the functions of the watch, especially in the case where the watch is stolen.

[0006] It can be understood that there is a need to find an alternative solution that in particular does not have the drawbacks of the prior art. Summary of the Invention

[0007] Accordingly, an object of the present invention is to provide a reliable and robust method for managing the use of functions of a watch.

[0008] Such a method has the advantage of ensuring the identity of the wearer of the watch in an automatic, transparent, and non-invasive manner for the wearer.

[0009] To this end, the present invention relates to a method for managing the use of functions of a watch, comprising:

[0010] - a step of authenticating the wearer of the watch to authorize access to the functions, and

[0011] - a step of controlling the identity of the wearer of the watch over a determined period to maintain access to the functions by verifying the validity of a digital identification element determined from at least one biometric information element of the wearer of the watch, and

[0012] - The step of unlocking access to the functions of the watch when the access has been locked after the verification of the digital identification element has shown the invalidity of the digital identification element, the step comprising the following sub-steps:

[0013] · Presenting a graphical representation on an interface for broadcasting visual information of the watch;

[0014] · Selecting, within a limited time interval, a sequence of at least two identification parts included in the graphical representation intended to identify the wearer, the sequence corresponding to the wearer's identification code, and

[0015] · Verifying the selected sequence.

[0016] In other embodiments:

[0017] - The selection sub-step includes a phase of visualizing at least one of the identification parts of the sequence in the graphical representation;

[0018] - The visualization phase includes a sub-phase of pre-selecting at least one region of interest in the graphical representation that can include the at least one identification part;

[0019] - The verification sub-step includes a comparison phase between the selected sequence and a reference sequence;

[0020] - The at least one biometric information element is included in a part of the wearer's skin;

[0021] - The control step includes a sub-step of acquiring, by means of at least one multispectral biometric skin sensor included in the watch, a plurality of images of a part of the wearer's skin adjacent to the sensor, the images including the at least one biometric information element included in this skin part;

[0022] - The control step includes a sub-step of generating a digital identification element from the at least one biometric information element;

[0023] - The control step includes a sub-step of verifying the digital identification element generated during the identity control of the intended wearer;

[0024] - The verification sub-step includes a comparison phase that includes a sub-phase of maintaining the authorization to access the functions of the watch if the generated digital identification element is substantially similar or similar to a reference digital identification element;

[0025] - The acquisition sub-step includes a phase of illuminating the skin part with different wavelengths;

[0026] - The acquisition sub-step includes a phase of capturing an image of the skin part illuminated with different wavelengths;

[0027] - The generation sub-step includes the phase of characterizing the at least one biometric information element included in the acquired image related to the skin portion;

[0028] - The generation sub-step includes the phase of designing a digital recognition element from the characterization of the biometric information element;

[0029] - The biometric information element is related to the blood vessel network or texture of the skin.

[0030] The present invention also relates to a system for managing the functional use of a watch, which implements the method, and the system includes the following elements connected together: a processing unit, a biometric sensor, an input interface, and an interface for broadcasting visual information.

[0031] Advantageously, the biometric sensor is a multi-spectral biometric skin sensor.

[0032] The present invention also relates to a watch including such a system, in particular a networked mechanical watch.

[0033] The present invention also relates to a computer program including program code instructions, which are used to execute the steps of the method when the program is executed by a processing unit. Description of the Drawings

[0034] Other particularities and advantages will be apparent from the following description given in an indicative and non-limiting manner with reference to the accompanying drawings, in which:

[0035] - Figure 1 is a schematic diagram of a watch according to an embodiment of the present invention, the watch including a system for managing the functional use of the watch, and

[0036] - Figure 2 is a flowchart related to the method for managing the functional use of a watch according to an embodiment of the present invention. Detailed Description of the Invention

[0037] Figure 1 Figure 100 shows a watch 100, which includes a system for managing the functional use of the watch 100. Such a system 1 is included in the watch 100, and the watch 100 is preferably a mechanical watch 100 connected to a hybrid display. In this context, the electronic device 100 includes a body (such as a watch case), and an attachment element (such as a wristband that allows the body to be fastened to, for example, the wrist of a wearer). The system 1 more specifically includes, in a non-limiting and / or non-exhaustive manner:

[0038] - A processing unit 2 including hardware and software resources, in particular at least one processor cooperating with a memory element 6;

[0039] - An interface 3 for broadcasting visual information, such as a hybrid display dial provided with a first analog display component and a second digital and / or alphanumeric display component;

[0040] - An interface 4 for broadcasting audio information, such as a speaker;

[0041] - A wireless communication interface 5 (e.g., cellular, WLAN, Bluetooth, etc.);

[0042] - An input interface 35, such as, for example, a keyboard or a touch interface included in the interface 3 for broadcasting visual information, and

[0043] - A biometric sensor (34), in this embodiment particularly a multispectral biometric skin sensor 33, such as a sensor 34 including at least one photographic sensor 36, at least one multispectral illumination source 37, and at least one thermal image sensor 38, the illumination source 37 being capable of emitting light radiation having a wavelength between 300 nm and 1100 nm, and additionally, the illumination source 37 may be of the laser type.

[0044] In this system 1, the processing unit 2 is particularly connected to the interfaces 3, 4 for broadcasting visual and sound information, connected to the input interface 35, and connected to the wireless communication interface 5 and the multispectral biometric sensor 34. It should also be noted that the multispectral biometric sensor 34 is arranged in the body of the electronic device 100 and / or in an attachment element.

[0045] The system 1 implemented in the electronic device 100 is capable of ensuring, in a discreet manner, the control of the identity of the authenticated wearer of the watch, that is to say, without the direct intervention / interaction of the wearer with the watch 100, so that he can use the functions of the watch 100 at all times when he wears the watch, without having to authenticate himself again. Then, in a transparent and discreet manner, the identification of the wearer is carried out from at least one biometric information element included in the skin of the wearer, such as the vascular network of the skin or the texture of the skin. The skin of the wearer covering the body of the wearer has particularities that are not very obvious to the consideration of those skilled in the art, because it is not naturally visible to the human eye and is related to the absorption and reflection characteristics of skin components located at different depths at different wavelengths (spectra). In a simplified model, the skin consists of a layer called the "epidermis", which is translucent and located on the surface, and then below the epidermis is a layer called the "dermis", and which includes blood vessels (or a vascular network), where hemoglobin has high reflectivity at high wavelengths close to red, for example included between 760 nm and 930 nm, which can reveal or show the vascular network of the wearer's skin here. In other words, the light absorption spectra of the components of the epidermis and dermis that make up the skin are non-uniform according to the electromagnetic wavelength, and the appearance and color of the skin are produced by a complex combination of these phenomena. Therefore, when it comes to showing or revealing a biometric information element (such as the texture of the skin of the wearer, a texture formed essentially by cracks or cavities), then the illumination of the skin can be ensured by restricting the illumination source to wavelengths near red, which tends to make the shadow phenomenon disappear from the bottom of the cracks. In fact, there is a back-projection effect through the reflection on the dermis and through the reflection of the epidermis of these wavelengths near red, while on the contrary, illuminating the skin with a color spectral source far from red (usually in the waveband located between purple (400 nm) and up to orange-yellow (600 nm)) allows a strong contrast of these cracks in the skin by the appearance of shadows at the bottom of these cracks. It should be noted that the identification of the biometric information elements included in the skin can be improved by using a thermal image sensor 38, preferably without using illumination. For example, in order to show the texture of the skin, especially when the relevant part of the wearer's skin has hair, it is preferable to use the thermal image sensor 38 instead of illumination. For example, in order to show the texture of the skin, especially when the relevant part of the wearer's skin has hair, using the thermal image sensor 38 allows the cracks of the texture of the skin to be revealed, which are usually warmer than the surrounding skin, and the hair is colder than the surrounding skin. Therefore, in this configuration, due to the difference between their respective temperatures, the hair can be thermally distinguished from the cracks in the skin texture.

[0046] It should be noted that, depending on the biometric information element that should be shown or revealed, the capture of the thermal image can be carried out under illumination of a given wavelength.

[0047] Thus, it should be understood that, according to the principles of the present invention, the periodic identification of the wearer is performed based on at least one biometric information element included in an image of a part of the wearer's skin, which image can be illuminated at different wavelengths as appropriate in order to capture an image including the desired biometric information element. Thus, the biometric information element included in these images can be shown by illumination performed at different wavelengths or without illumination (e.g., when it comes to capturing a thermal image).

[0048] In the system 1, the memory element 6 of the processing unit 2 includes data related to previously defined / generated reference digital identification elements. These memory elements 6 also include a digital image processing algorithm 39 that allows characterizing at least one biometric information element related to the wearer's skin, and this information is included in an image related to a part of the wearer's skin. These memory elements 6 also include an algorithm 40 for generating reference digital identification elements and also for generating digital identification elements that are periodically generated as part of the control of the wearer's identity.

[0049] These memory elements 6 of the processing unit 2 also include at least one graphical representation 41 that is provided to participate in the unlocking of access to the functions of the watch 100. The graphical representation 41 can be, for example, an image including at least one object. By way of example, the image defines a scene including a plurality of objects, such as a house, a vehicle, and / or stars such as the moon. It will be clearly understood that the image can define other types of scenes including at least one object. These memory elements 6 also include data related to a reference sequence 42 that includes a reference identification part of the graphical representation 41, which part has been preselected by the wearer of the watch during the process of configuring the unlocking of access to the functions of the watch 100.

[0050] Such a system 1 of the watch 100 is capable of implementing Figure 2 the method of use for the secure access to the functions of the watch 100 as shown. This method aims to ensure, in a discreet manner, i.e., in a non-invasive and automatic manner, the identity of the authenticated wearer so that he can use the functions of the watch 100 at all times when wearing the watch 100 without having to authenticate himself again. The functions of the watch 100 can be related to the setting of time, date, or alternatively to the use of a stopwatch, a navigation system, a pedometer, an activity tracker, a messaging system, the access to confidential or private data specific to the wearer and useful for accessing personalized services, etc.

[0051] The method includes step 10 of authenticating the wearer of the watch 100 to authorize access to the functions of the watch 100. This step 10 allows the wearer to provide evidence of their identity. In fact, the wearer can interact with the input interface 35 to authenticate using an authenticator or a password.

[0052] Then, the method includes step 12 of carefully controlling the identity of the wearer of the watch at a determined period by verifying the validity of a digital recognition element determined from at least one biometric information element included in a skin portion of the wearer of the watch, so as to maintain / remove the authorization to access these functions. During this step 12, the determined period is a regular or irregular control period, which can be automatically configured by the processing unit 2 or defined by the wearer. For example, the period can be a few seconds or a few minutes. This control step 12 allows verifying that the wearer of the watch remains the same by controlling their "biometric" identity at the end of each period based on a digital recognition element established depending on at least one biometric information element included in the skin of this wearer.

[0053] This control step 12 then includes sub-step 13, which acquires a plurality of images of a portion of the wearer's skin by means of the sensor 34, the skin being arranged adjacent to the sensor, the images including the at least one biometric information element included in this skin portion. This sub-step 13 includes a stage 14 of illuminating the skin portion with different wavelengths. More specifically, during this stage 14, the processing unit 2 drives the multispectral biometric sensor 34, and in particular the illumination source 37, such that the latter emits light radiation in the direction of the skin portion according to an exact wavelength suitable for showing or revealing the at least one biometric information element specific to the skin, the at least one biometric information element being sought here as part of the control of the wearer's identity and being included in this portion of the wearer's skin. Once the illumination has been configured, the acquisition sub-step 13 includes a stage 15 of capturing an image of the skin portion illuminated at at least one wavelength capable of showing or revealing the at least one biometric information element. During this stage 15, the processing unit 2 drives the multispectral biometric skin sensor 34, and in particular the photographic sensor 36, synchronously with the activation / deactivation of the illumination source 37, in order to capture at least one image related to the skin portion illuminated for at least one wavelength.

[0054] This acquisition sub-step 13 can also include a stage 16 of capturing at least one thermal image of the skin portion. This stage 16 is preferably carried out without illumination, but in other alternatives, illuminating the portion can be carried out at least at one given wavelength, which clearly depends on the biometric information element that should be shown or revealed. This stage 16 can be carried out before or after the illumination stage 14 and the image capture stage 15.

[0055] Control step 12 then includes sub-step 17, which generates a digital recognition element from the at least one biometric information element included in the image of the acquired skin portion. Such sub-step 17 includes a stage 18 of characterizing the biometric information element included in the image related to the skin portion. During this stage 134, the processing unit 2 implements an algorithm 39 for processing the acquired image, aimed at identifying / detecting in each of the acquired images the at least one biometric information element included in the acquired image. As already mentioned previously, it can be, for example, an information element related to the texture of the skin or the vascular network included in this part of the wearer's skin. For example, the implementation of these algorithms 39, 40 by the processing unit 2 can provide a process of cutting these images into segments. It should be understood here that each acquired image gives an overall view of the skin portion of the wearer, and then includes regions with different correlations for identifying the at least one biometric information element. Such a cutting process participates in extracting the segments to be processed and in eliminating the parts not processed in these images. Then, these algorithms 39 can provide an index of these image segments, which includes features related to the at least one specific biometric information element to be identified by the positioning region in the skin portion, so as to be able to assign appropriate processing related to the morphological typology of the features of this geographical region of this part to each region. In this context, these algorithms 39 process each segment of these images by performing image analysis operations of the processing, transformation, and detection types, thereby showing the multiple information carried by the pixels of each of these images. Subsequently, these algorithms 39 perform feature filtering and extraction or vectorization operations in order to convert the image data related to the at least one identified and extracted biometric information element into parameter data, usually relative numerical values expressed as, for example, indices or percentages.

[0056] It is understood here that acquiring multiple images representing the same skin helps to improve the accuracy and efficiency of this characterization stage 18.

[0057] Subsequently, generation sub-step 16 includes a stage 19, which designs a digital recognition element from the characterization of the at least one biometric information element. During this stage 19, the processing unit 2 implements an algorithm 40 for generating such a digital recognition element, which is specifically provided for processing the parameter data obtained during the characterization stage 18, which is related to the biometric information element.

[0058] Then, control step 12 includes sub-step 20, which verifies the digital identification element generated during the control of the identity of the intended wearer. This verification sub-step 20 includes a comparison phase 21 between the generated digital identification element and a reference digital identification element implemented by the processing unit 2. In this method, during step 11 of defining this reference digital identification element which defines sub-steps similar to the acquisition 13 and generation 17 sub-steps implemented during control step 12, once the wearer has been properly authenticated and their identity determined, the reference digital identification element can be created. In this method, once the wearer of the watch 100 has been authenticated, the processing unit 2 implements this definition step 11 and then archives the reference digital identification element obtained in the memory element 6 of the processing unit 2. Thus, the reference digital identification element can be automatically determined by the processing unit 2 during the adjustment process or can be configured by the wearer to guide the wearer in defining this reference digital identification element.

[0059] The comparison phase 21 also includes a sub-phase 22 of maintaining the authorization to access the functions of the watch 100 if the generated digital identification element is substantially similar or similar to the reference digital identification element. In this case, the control unit 2 re-executes the acquisition 13 and generation 17 sub-steps of control step 12 according to a determined time period in order to re-execute the comparison phase 21.

[0060] Conversely, this comparison phase 21 includes a sub-phase 23 of removing the authorization to access the functions of the watch 100 if the generated digital identification element is substantially different or different from the reference digital identification element. In this case, since the wearer and owner of the watch 100 may no longer have the watch 100, access to the functions of the watch 100 is removed. Thus, in this context, this sub-phase 23 provides a locked access to the watch functions. Therefore, in order to use the functions of the watch 100 again, the access needs to be unlocked.

[0061] For this purpose, the method includes step 24 of unlocking the access to the functions of the watch 100 when the access has been locked after the verification of the digital identification element shows its invalidity.

[0062] This step 24 includes a sub-step 25 of presenting a graphical representation 41 on an interface 3 for broadcasting visual information of the watch 100. This sub-step 25 includes a phase 26 of generating a display on / in the interface 3 for broadcasting visual information of the graphical representation 41, which is provided for achieving access to the functions of the watch 100 for this unlocking. This phase 26 may include a sub-phase of selection by the wearer from a sample of at least two graphical representations displayed on the interface 3 for broadcasting visual information, the graphical representation 41 being provided for achieving this unlocking. It will be noted that the wearer is the only person who already knows the graphical representation 41 he has selected when configuring the process for unlocking access to the functions of the watch 100.

[0063] Then, this presenting sub-step 25 includes a phase 27 of triggering a countdown once the generation phase 26 is executed. In other words, once the graphical representation 41 is presented on the broadcast interface 3, a pre-configurable countdown is triggered. This phase 27 participates in calculating the estimated time required for a sequence of recognition parts of the graphical representation 41 displayed on / in the broadcast interface 3 from the limited time interval defined by this countdown.

[0064] Subsequently, the unlocking step 24 includes a sub-step 28 of selecting, within a limited time interval, a sequence of at least two recognition parts in the graphical representation 41 aimed at identifying the wearer, the sequence corresponding to the wearer's identification code. Such recognition parts are not directly visible in the graphical representation 41 presented on / in the broadcast interface 3. Under these conditions, the selection sub-step 28 includes a phase 29 of visualizing at least one recognition part of the sequence of recognition parts in the graphical representation 41. This visualization phase 29 includes a sub-phase of selecting at least one region of interest of the graphical representation 41 that can include the at least one recognition part. During this sub-phase, the wearer selects, for example, a first region of interest or a second region of interest by performing a zoom-in on this first region or this second region from the input interface 35. Once the first or second region of interest is selected, the recognition part becomes visible. In this configuration, each recognition part useful for performing / composing the sequence can be selected from the input interface 35.

[0065] It should be noted that the sequence includes an ordered number of recognition parts, and the selected region of interest may include, for example, three recognition parts, where only two recognition parts are sorted one after another continuously in the sequence. In this context, in order to be part of the sequence, the remaining recognition part needs to select a recognition part included in another region of interest of the graphical representation 41.

[0066] Then, unlocking step 24 includes a sub-step 30 of verifying the selected sequence. This verification sub-step 30 includes a phase 31 that controls the following steps: identifying that the selection of the partial sequence has been performed within a limited time interval defined by a countdown. As long as this selection has been made within this limited time interval, the verification sub-step 30 then includes a comparison phase 32 implemented by the processing unit 2 between the selected sequence and a reference sequence 42. This comparison phase 32 includes a sub-phase of prohibiting access to the functions of the watch 100 if the sequence is substantially different or different from the reference sequence 42. On the contrary, this comparison phase 32 includes a sub-phase of authorizing access to the functions of the watch 100 if the sequence is substantially similar or similar to the reference sequence 42.

[0067] As long as the selection has not been performed within the limited time interval, the verification sub-step 30 includes a phase 33 of updating the rendering 25 and selection 28 sub-steps. If the selection of the sequence is not performed again within the limited time interval subsequently, the verification sub-step 30 then provides a sub-step of definitely blocking the functions of the watch 100 during a given time period or otherwise.

[0068] The invention also relates to a computer program comprising program code instructions for performing steps 10 to 33 of the method when the program is executed by the processing unit 2 of the watch 100.

Claims

1. A method for managing the use of functions of a watch (100), comprising: - a step (10) of authenticating a wearer of the watch (100) to authorize access to the functions, and - a step (12) of controlling the identity of the wearer of the watch for a determined period to maintain access to the functions by verifying the validity of a digital identification element determined from at least one biometric information element of the wearer of the watch, and - a step (24) of unlocking access to the functions of the watch (100) when the access has been locked after verification of the digital identification element has shown the invalidity of the digital identification element, the step comprising the following sub-steps: · presenting (25) a graphical representation (41) on an interface (3) for broadcasting visual information of the watch (100); · selecting (28) a sequence of at least two identification parts included in the graphical representation (41) intended to identify the wearer within a limited time interval, the sequence corresponding to an identification code of the wearer, the limited time interval being defined by a countdown that starts once the graphical representation is presented on the interface, and · verifying (30) the selected sequence, wherein the selection sub-step comprises visualizing the at least two identification parts as identification parts invisible in the graphical representation on the interface for broadcasting the watch, the at least two identification parts becoming visible by the wearer magnifying a first area of interest so that the at least two identification parts are visible within the first area of interest after the magnification and then the wearer must select the at least two identification parts in the sequence after the at least two identification parts have become visible, the first area of interest being a visible part of the graphical representation before the magnification, and the sequence corresponding to the identification code of the wearer.

2. The method according to claim 1, characterized in that, The verification sub-step comprises a comparison phase between the selected sequence and a reference sequence (42).

3. The method according to claim 1, wherein The at least one biometric information element is included in a part of the wearer's skin.

4. The method according to claim 1, wherein The control step (12) comprises a sub-step (13) of acquiring a plurality of images of a part of the wearer's skin adjacent to the sensor (34) by at least one multispectral biometric skin sensor (34) included in the watch (100), the images including the at least one biometric information element included in the skin part.

5. The method according to claim 4, characterized in that, The control step (12) comprises a sub-step (17) of generating a digital identification element from the at least one biometric information element.

6. The method according to claim 1, wherein The control step (12) comprises a sub-step (20) of verifying the digital identification element generated during control of the identity of the wearer.

7. The method according to claim 6, wherein The sub-step (20) of verifying the digital identification element generated during control of the identity of the wearer comprises a comparison phase (21), the comparison phase (21) comprising a sub-phase (23) of maintaining authorization to access the functions of the watch if the generated digital identification element is substantially similar or similar to a reference digital identification element.

8. The method according to claim 4, wherein The obtaining sub-step (13) includes a stage (14) of illuminating the skin portion with different wavelengths.

9. The method according to claim 4, wherein The obtaining sub-step (13) includes a stage (15) of capturing an image of the skin portion illuminated with different wavelengths.

10. The method according to claim 5, characterized in that The generating sub-step (17) includes a stage (18) of the at least one biometric information element included in the acquired image related to the skin portion.

11. The method according to claim 5, wherein The generating sub-step (17) includes a stage (19) of designing the digital recognition element from the representation of the biometric information element.

12. The method according to claim 1, wherein The biometric information element is related to the vascular network or texture of the skin of the wearer.

13. The method according to claim 1, wherein The sequence corresponding to the identification code of the wearer includes selecting an additional identification portion after the at least two identification portions, the additional identification portion being located in a second region of interest different from the first region of interest including the at least two identification portions.

14. A system for managing the use of functions of a watch (100), the system (1) comprising the following elements connected together: a processing unit (2), a biometric sensor (34), an input interface (35), and an interface (3) for broadcasting visual information, the elements being configured to implement the method according to any one of claims 1 to 13.

15. The system according to claim 14, wherein The biometric sensor (34) is a multispectral biometric skin sensor.

16. A watch (100) comprising the system (1) according to any one of claims 14 and 15.

17. The watch according to claim 16, wherein the watch comprises a networked mechanical watch (100).

18. A computer program product, the computer program product comprising a computer program, the computer program comprising program code instructions which, when executed by a processing unit (2), are for performing the steps of the method according to any one of claims 1 to 13.

19. A non-transitory computer-readable storage medium having stored thereon a computer program, the computer program comprising program code instructions which, when executed by a processing unit (2), are for performing the steps of the method according to any one of claims 1 to 13.

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