Patent Publication Number: US-2010125706-A1

Title: Provision of data stored in a memory card to a user device

Description:
CROSS REFERENCE TO RELATED APPLICATION  
     This application claims priority to European (EP) Patent Application No. 08017902.1, filed on Oct. 13, 2008, the contents of which are incorporated by reference as if set forth in their entirety herein. 
     BACKGROUND  
     Memory cards are integrated circuit (IC) cards including non-volatile memory and a controller, which controls the operation of the memory card. Such memory cards are used with personal computers (PCs), cellular telephones, personal digital assistants (PDAs), digital cameras, portable audio players and other host electronic devices for storage of data. A plurality of standards exists that specify different types of memory cards, such as, for example, SD (Secure Digital) cards, CF (Compact Flash) cards and MMCs (Multimedia Cards). A further example of a memory card, in the sense the term is used herein, is a USB (Universal Serial Bus) flash memory device. 
     Often, the memory card is used with a portable host device and stores data, which have been generated or received in the portable host device or example, the memory card may be used in mobile communication device and stores data received by means of the mobile communication device or it stores photos and/or videos that have been generated by means of the mobile communication device. 
     However, the user may wish to have the data stored in the memory card available in another user device, such as, for example, a home PC of the user. For providing the data to the user device, the user may disconnect the memory card from the host device and may connect it to the user device. Then, the data can be transferred from the memory card to the user device. However, this is cumbersome for the user and requires that the user device disposes of an interface for connecting the memory card to the user device. 
     SUMMARY OF THE INVENTION 
     Exemplary embodiments of the present invention relate to memory cards, which can be temporarily connected to host devices. More specifically, such exemplary embodiments relate to a method and a system for providing data stored in at least one memory card to a user device. 
     Exemplary embodiments of the present invention facilitate the provision of data stored in a memory card used with a host unit to another user device. 
     In one exemplary embodiment of the present invention, a method for providing data stored in at least one memory card to a user device is provided. The exemplary method comprises the following steps:
         connecting the memory card to a host unit, which is connectable to the user device;   determining in the host unit that added data is stored in the memory card, said added data have not been transmitted to the user device; and   transmitting the added data and/or information identifying the added data from the host unit to the user device, if a data connection between the user device and the host unit exists.       

     According another exemplary embodiment of the invention, a system for providing data stored in at least one memory card to a user device is suggested. The exemplary system comprises a host unit coupled to an interface device, said interface device being adapted to connect the host unit to the memory card. The system further comprises a managing unit included in the host unit, the managing unit being adapted to determine that added data is stored in the memory card, said added data have not been transmitted to the user device; and the managing unit being further adapted to transmit the added data and/or information identifying the added data to the user device, if a data connection between the user device and the host unit exists. 
     In an exemplary embodiment of the present invention, data can be transferred to the user device using a data connection between the host unit and the user device. This disburdens the user from connecting the memory card to the user device in order to transfer the data to the user device. Moreover, the user device does not need to dispose of an interface device for connecting the user device to the memory card. 
     Furthermore, an exemplary embodiment of the present invention may provide that the same data are not transferred to the user device repeatedly. This is achieved by determining added data and by transferring only the added to the user device. 
     The host unit may be any device that can be used with the memory card. In particular, the host unit may be a portable device. In one exemplary embodiment, the host unit is a mobile communication device to which the memory card is connected. The user device may be a PC of the user, such as, for example, a home PC. However, in principle, the user device can be any device that is connectable to the host unit via a data connection to receive data. 
     The exemplary data connection may comprise a data connection that is established for other purposes than the transfer of added data, or the data connection may be established automatically. Thus, an already provided data connection can be used for transferring the added data to the user device. For instance, the data connection may comprise a radio link between the host unit and the device, which is automatically established, when the host unit and the device are within the range of the radio link. 
     In one exemplary embodiment of the method and the system, at least one register is provided, said register identifying data that have been transmitted to the user device. 
     In this exemplary embodiment, a register may be used to determine which data have been added to the memory card. 
     Another exemplary embodiment of the method and the system comprises that it is determined that data stored in the memory card are added data, if said data is not identified in the register. 
     The register may be available in the host unit. In one exemplary embodiment of the method and the system, the register is stored in the host unit. 
     In such an exemplary embodiment, the host unit manages the register. If the host unit is a mobile communication device, the register may particularly be stored in a SIM card of the mobile communication device. Thus, the register can be made available in another host unit by connecting the SIM card to another host unit. 
     The SIM card may be a smartcard comprising a SIM (Subscriber Identity Module) according to the GSM (Global System for Mobile Communications), the SIM application being used to identify and/or authenticate a subscriber in a mobile communication network according to the GSM standard. However, the term SIM card, as used herein, is to be understood as including also smartcards comprising USIM (Universal Subscriber Identity Module) applications according to the UMTS (Universal Mobile Telecommunications System) standard or other applications providing authentication and/or identification functions in connection with a mobile communication network. 
     In a further exemplary embodiment of the method and the system, the register may be stored in the memory card. In an exemplary embodiment of the present invention, the register is physically assigned to the memory card. This facilitates the management of the register, in particular, if multiple memory cards are used with one host unit or even with multiple host units, which can be connected to the user device. 
     In one exemplary embodiment of the method and the system, the added data and/or information identifying the added data is transmitted to the user device, when it is realised that the data connection exists. 
     In an exemplary embodiment of the present invention, the transfer of the added data and/or of the information identifying the added data can be initiated automatically, when it is determined that the data connection between the host unit and the user device exists. This may be useful, in case the data connection temporarily connects the host unit and the user device. 
     In a further exemplary embodiment of the method and the system, added data and/or information identifying added data is transmitted to the user device periodically. 
     In this exemplary embodiment, the transfer of added data and/ or information identifying added data can be done according to a predetermined time scheme. The time scheme may be configured by the user of the host unit and/or the user device. In particular, the user may specify the periodic time between the transfers. 
     One exemplary embodiment of the method and the system comprises that the information identifying the added data is transmitted to the user device at a first time and the added data is transferred to the user device at a second time later than the first time. 
     The information identifying the added data may comprise information, which allows the user to identify the data. For instance, this may be names of data files stored in the memory card. The data itself, i.e. the data content of files stored in the memory card, are preferably not included in the information identifying the added data. 
     The information identifying the added data has a smaller data volume than the data itself. Therefore, by providing only information identifying the added at first, the user device can be efficiently informed about added data, while the load of the data connection is kept low. 
     In one exemplary embodiment of the method and the system, the added data is transmitted via the data connection with a lower priority than further data transmitted via the data connection. 
     In this exemplary embodiment, the added data itself can be transmitted to the user device, when no other data have to be transmitted to the user device with high priority. In particular, the added data may be transferred to the user device, when it is determined that a load of the data connection is low. 
     In a further exemplary embodiment of the method and the system, the added data is transmitted to the user device upon a receipt of a request in the host unit. 
     In particular, the user device may request the added data after having received the information identifying the added data. Here, the user may select added data to be requested using the information identifying the added data. 
     If the added data is transmitted to the user device upon a request of the user device, one exemplary embodiment of the method and the system provides that the added data is transmitted to the user device with a priority that is equal to or higher than the priority of other data transferred via the data connection. This allows transmitting requested added data to the user device particularly quickly. 
     The memory card may store data the user wants to protect against unauthorised access by third parties. Therefore, in one exemplary embodiment of the method and the system, the memory card allows the host unit to read the added data and/or the information identifying the data after a credential has been successfully verified in the memory card, the credential being provided to the memory card by the host unit. 
     In this exemplary embodiment, the memory card advantageously provides a security mechanism controlling access to the data stored in the memory card. The security mechanism grants access to the data after having successfully verified a credential provided by the host unit. 
     The credential may be securely stored in the host unit. If the host unit is a mobile communication device, the credential may particularly be stored in the SIM card of the mobile communication device. Here, the security mechanism already existing in the SIM card protects the credential from being accessed without permission. 
     In a further exemplary embodiment of the method and the system, at least part of the added data is stored in the memory card in an encrypted form, and the encrypted part of the added data is decrypted before it is transmitted to the user device, the decryption being made using a decryption key securely stored in the host unit. 
     In particular, this exemplary embodiment allows for securely storing data in a memory card, which does not dispose of a security mechanism of the type described before. 
     If the host unit is a mobile communication device, the decryption key may particularly be stored in the SIM card of the mobile communication device, the SIM card protecting the decryption key against unauthorised access. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
       Reference will be made by way of example to the accompanying drawings in which: 
         FIG. 1  is a block diagram of a system for providing data stored in a memory card to a user device according to an exemplary embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS  
       FIG. 1  schematically shows components of a system for providing data stored in a memory card  102  to a user device  114  of the memory card user. The memory card  102  can store any kind of data, such as, for example, music files, digital photos, videos or other documents of the user. Since the memory card  102  can be carried along by the user, it allows him to have the data at his disposal any time. 
     The memory card  102  comprises a memory  106  and a microcontroller  108  integrated into a housing. The housing may be small enough so that the owner can carry the memory card  102  easily and that the memory card  102  can be used in connection with card readers, which are integrated into small devices, such as, mobile communication devices. The memory card  102  may be configured according to a standard format, and may be an SD card, a CF card, a MMC or the like. Another example of a memory card format in the sense of this disclosure is a USB flash memory device. The standard format may particularly specify the size and shape of the memory card  102 , the configuration of its electric contacts and/or the communication protocols used in the communication with the memory card  102 . The standard compliance of the memory card  102  allows the card to be accessed using card reader devices, which are likewise compliant with the standard. 
     The memory  106  is a non-volatile storage that can be electrically erased and reprogrammed. Particularly, the memory  106  may be configured as a solid state storage unit, particularly as flash memory or as non-flash EEPROM (Electrically Erasable Programmable Read-Only Memory). However, the person skilled in the art understands that in principle any sort of memory unit may be used. The memory  106  may be constituted by one or more memory chips, which are arranged in the housing of the memory card  102 . 
     The microcontroller  108  and the memory  106  may reside on one single chip within the memory card  102  or the microcontroller  108  may be a separate chip connected to the memory  106 . The microcontroller  108  provides functionality for accessing the memory  106  using devices to which the memory card  102  is connected. In particular, the microcontroller  108  implements the communication protocols used for the data exchange between the memory card  102  and a connected device. 
     In the system depicted in  FIG. 1 , the memory card  102  is used with the host device  110 . In one exemplary embodiment, the host device  110  is a mobile communication device, such as, for example, a cellular phone, a PDA (Personal Data Assistant) or the like. The host device  110  comprises a microprocessor controlling the operation of the host device  110 . The microprocessor is coupled to a memory unit that stores software programs that can be run on the microprocessor and data used in the operation of the host device  110 . A user may operate the host device  110  using an input unit, such as, for example, a keypad, and a display unit, such as, for example, a monitor. The input unit and the display unit are also coupled to the microprocessor. 
     Furthermore, the host device  110  may comprise a radio module, which is not shown in  FIG. 1 , the radio module allowing connecting the host device  110  to a mobile communication network via a radio access network. For instance, the mobile communication network may be a GSM or a UMTS network. 
     In particular if the host device  110  is configured as a mobile communication device, a smartcard  112  is inserted into the host device  110 . For receiving the smartcard  112 , the host device  110  may comprise a card reader that is not depicted in  FIG. 1 . The smartcard  112  comprises a microcontroller providing a secure environment for the execution of applications and the storage of data. Particularly, this means that unauthorized access to data and processes is prevented due to the hardware design of the microcontroller and due to cryptographic mechanisms used for managing data in the microcontroller. Moreover, the smartcard  112  is physically protected against manipulations, such as, power analysis, reverse engineering etc. 
     Accessing the functions of the smartcard  112  and data stored therein requires that the smartcard  112  authenticates the user of the host device  110 . The user authentication is performed using a secret credential allocated to the user, which is entered at the host device  110  and passed to the smartcard  112 . In the smartcard  112 , the credential is checked by a security mechanism, which unlocks the functions and data after having successfully verified the credential. Furthermore, it may be provided that all or some of the functions of the host device  110  are protected and have to be unlocked by the smartcard  112 . The smartcard  112  may unlock these functions after having successfully verified the credential. 
     The smartcard  112  may be used in conjunction with a utilization of the host device  110  in the mobile communication network. In particular, the smartcard  112  may comprises an application, which provides identification and authenticating services to the mobile communication network. If the mobile communication network is a GSM network, the smartcard  112  is configured as a SIM card according to the GSM standard comprising a SIM application, which provides the identification and authentication service. If the mobile communication network is a UMTS network, the smartcard  112  is configured as a UICC (Universal Integrated Circuit Card) comprising a USIM application providing the identification and authentication service. 
     In the following, the smartcard  112  is referred to as SIM card. However, the term SIM card, as used herein, is to be understood as including also smartcards  112  comprising USIM applications or corresponding applications providing authentication and/or identification functions in connection with a mobile communication network. 
     For using the host device  110  in connection with the memory card  102 , the host device  110  further comprises an interface component  128  for connecting the memory card  102  to the host device  110 . The interface component  128  is coupled to the microprocessor of the host device  110  thereby allowing the microprocessor to access the memory card  102 . The interface component  128  may be a built-in component of the host device  110 , as it is depicted in  FIG. 1 , or it is separated from the host device  110  and connected to the host device  110  via a data link. 
     In one exemplary embodiment, the interface component  128  is a card reader unit, which is adapted to a certain memory card format in such a way that it is able to receive the memory card  102 . In a further exemplary embodiment, the memory card  102  may provide wireless connectivity via a radio interface or an optical interface. Here, the interface component  128  may be configured as a corresponding wireless communication interface allowing establishing a radio connection or an optical connection between the host device  110  and the memory card  102 . The radio connection may be Bluetooth connection or a short range radio connection, such as, for example, an NFC (Near Field Communication) or a ZigBee connection, and the optical connection may be an infrared (IR) connection, for example. 
     In particular, the host device  110  is used in the system depicted in  FIG. 1  for providing data stored in the memory card  102  to the user device  114 . The memory card  102  may be used as storage of the host device  110  in addition to the integrated memory unit of the host device  110 . 
     In particular, the memory card  102  may store data that are used in the host device  110 , such as for example audio or video files or digital pictures. For instance, the digital pictures may be taken using the host device  110 , if the host device  110  disposes of a digital camera. This is usually the case, if the host device  110  is a mobile communication device, such as, a cellular phone or a PDA, since such devices usually comprise an integrated digital camera. Audio and/or video files may be downloaded to the host device  110  via the mobile communication network, for example. Such networks often provide services for downloading audio and/or video data. 
     In the aforementioned scenarios, the memory card  102  may serve as optional memory extension, as it is often provided with host devices  110 , such as mobile communication devices. Here, the memory card  102  may be connected to the host device  110  essentially permanently. However, the user may also temporarily disconnect the memory card  102  from the host device  110  in order to copy data from a certain data source to the memory card  102 . 
     Although in  FIG. 1  only one memory card  102  is depicted, the user may dispose of multiple memory cards  102  of the aforementioned type. The user may use the memory cards  102  with the same host device  110 . For instance, the user may replace one memory card  102  with another memory card  102 , in case the data content has reached the full capacity of the first memory card  102 . Likewise, the user may of course also have other reasons to use multiple memory cards  102  with one host device  110 . Furthermore, more than one host device  110  may be used. One user may have two or more host devices  110  or more than one user may dispose of a host device  110 , which is connectable to the user device  114 . Each host device  110  may be used together with one or more memory cards  102 . 
     The user device  114  is a further device of the system depicted in  FIG. 1  in which a user wants to have the data stored in the memory cards  102  available. For instance, the users want to use the data not only in the host devices  110  but also in the user device  114  and/or the users want to backup the data in the user device  114 . 
     In one exemplary embodiment, the user device  114  is a PC, such as, for example a home PC of the user or a PC at his place of work. In particular, the user device  114  may comprise a programmable microprocessor and a memory for storing software programs that can be executed by the microprocessor and for storing data. The user device  114  may comprise a display unit, such as, for example, a monitor, to present information, and the user may operate the user device  114  using an input unit, such as, for example a keyboard. 
     Between each host device  110  and the user device  114  a data connection  116  can be established via at least one communication channel. In different exemplary embodiments of the system, the data connection  116  may be a wired connection or a wireless connection, for example. The wired connection may be a serial connection or a USB (Universal Serial Bus) connection. For wirelessly connecting the host device  110  and the user device  114  a radio link may be established. For instance, the radio link may be a Bluetooth connection based on the Bluetooth standard, which is known to a person skilled in the art. Other communication channels, which may be used for wirelessly connecting the host device  110  and the user device  114 , are radio connections based on a short range radio technology, such as, for example the NFC technology or the ZigBee technology. Likewise, the devices  110 ,  114  may be connected via an optical data connection  116 , such as, for example, an infrared (IR) connection. As a further alternative, the data connection  116  may also be established via a data network to which the devices  110 ,  114  are connected. For instance, the data network may be a local area network to which the host device  110  may be connected wirelessly using a WLAN (Wireless Local Area Network) link. Furthermore, the host device  110  and the user device  114  may be connected to each other via a wide area network. In particular, the network connection may be established via a mobile telecommunications network to which the host device  110  is connectable. The mobile communication network may provide a gateway to an IP (Internet protocol) network, particularly to the Internet, to which the user device  114  may be connected so that the host device  110  and the user device  114  can be connected to each other via the mobile communication network and the IP network. 
     For establishing the data connection  116 , the host device  110  and the user device  114  comprise connection interfaces  118 ,  120 . The connection interfaces  118 ,  120  are configured according to the communication channel, which is provided for the data transfer, and allow for sending and receiving data via this communication channel. 
     In exemplary embodiments of the invention, there may exist multiple data connections  116  between the host device  110  and the user device  114 . Here, each of the devices  110 ,  114  may comprise multiple connection interfaces  118 ,  120  so that multiple communication channels are available for the data transfer. For instance, the host device  110  may be connected to the user device  114  via a local radio connection and, at the same time, it is possible to transfer data from the host device  110  to the user device  114  via the mobile communication network. Each data connection  116 , which can be established, is registered in the host device  110 . For this purpose, the host device  110  stores configuration data, which particularly specify the possible data connections  116 . 
     For transferring data stored in the memory card  102  to the user device  114 , the host device  110  comprises a sending component  122 , which is configured to transmit data stored in the memory card  102  and/or information identifying data stored in the memory card  102  to the user device  114  via one available data connection  116 . The sending component  122  is coupled to a managing unit  124 , which controls the data transfer. The sending component  122  and the managing unit  124  may be configured as software applications, which are executed in the microprocessor of the host device  110 . The user device  114  comprises a receiving component  126 , which receives the data transferred from the host device  110  to the user device  114  and which stores the received data in the memory of the user device  114 . Similar to the sending component  122  and the managing unit  124  of the host device  110 , the receiving component  126  may be configured as a software application executed by the microprocessor of the user device  114 . 
     The information identifying data stored in the memory card  102  may be a file index concerning data files stored in the memory card  102 . The file index may specify names of files stored in the memory card  102 . In addition, the types of the files and/or other information relating to the files may be specified in the index. The type of file is typically indicated by a file name extension, which is indicative of a file type and/or a file format. 
     Before files stored in the memory card  102  or a file index is transferred to the user device  114 , the managing unit  124  of the host device  110  determines the files, which have not been transferred to the user device  114  yet or the files that have not been specified in a file index already sent to the user device  114 . For this purpose, the managing unit  124  may mark the files, which have been transferred to the user device  114 . If the transmission of a file index is provided, the managing unit  124  may additionally mark a file, when it has been specified in an index transferred to the user device  114 . The markings may comprise a code, which may be incorporated into a file name of the file by renaming the file in the memory card  102 . As an alternative the files may comprise so-called meta data, in which the code can be incorporated. Meta data are information appended to a file in addition to the use data contained in the file. 
     In an alternative embodiment, the managing unit  124  may keep a register indicating, which files have been transferred to the user device  114  and which files have been specified in an index transferred to the user device  114 . Moreover, in one exemplary embodiment, the register may identify files that have been modified or deleted after they have been transferred to the user device  114 . In the register, the files may be identified using the file names. However, the files names may not be unique. Therefore, further data like the size and/or the creation date may be used in addition to identify a file. Alternatively, a unique identification code may be assigned to the files and used for identifying the files in the register. The identification codes may be also be attached to a file by adding them to the meta data of the files. 
     In order to be able to allocate the register to a memory card  102 , the memory card  102  is identified in the register. This may be done using an identification code of the memory card  102 , which is specified in the register and which is also stored in the memory card  102 . The register is included in a file or database, which may be stored in the host device  110 . In one exemplary embodiment, the register is particularly stored in the SIM card  112  inserted into the host device  110 . This has the advantage that the register can be made available in another host device  110  by inserting the SIM card  112  into the other host device  110 . Thus, if the user replaces the host device  110  with a new one that is operated with the same SIM card  112 , the register is directly available in the new host device  110 . If multiple memory cards  102  are used with one host device  110 , one register is kept for each memory card  102 . The registers allocated to different memory cards  102  may be stored in one file or database or in a plurality of files or databases. 
     As an alternative, the register may also be stored in the memory card  102  concerned and the host device  110  may read the register, when the memory card  102  is connected to the host device  110 . Storing the register in the memory card  102  is particularly useful, if the memory card  102  is used with different host devices  110 , since the register is available in each of the host devices  110 . 
     One memory card  102  may also be used in connection with multiple host devices  114 . In this case, one register of the type described may be provided for each user device. In the different registers the user devices  114  may be identified using unique identification codes of the user devices  114 . Here, the host device  110  may request the identification code from the user device  114  in order to select the register allocated to the user device  114 , before transferring data to the user device. 
     In one exemplary embodiment, the transfer of the data or the index is time-controlled. In this exemplary embodiment, the transfer is initiated once in a predetermined time interval, such as a day or a week. Furthermore, a predetermined point in time may be specified. This may be a predetermined time of the day, if a daily data transfer is provided or a predetermined time of a specific day of week, if the data is to be transferred weekly. The time for the transfer may be specified by the user of the host device  110  and may be stored in the configuration data. 
     In addition to the time of the transfer, one or more communication channels may be specified for the data transfer. When data or indices are to be transferred, the managing unit  124  checks, whether at least one specified communication channel is available. If the managing unit  124  determines that exactly one specified communication channel is available, it instructs the sending component  122  to use the communication channel for transferring the data or index. If more than one communication channel is specified, an order of the communication channels may also be given. If the managing unit  124  determines that at least two specified communication channels are available, it selects the communication channel available with the highest order and instructs the sending component  122  to send the data via this communication channel. The order can be defined by user of the host device  110  and may be stored in the configuration data. 
     In another exemplary embodiment, at least one communication channel is specified in the configuration data and the managing unit  124  monitors, whether at least one of the specified communication channels is available. If the managing unit  124  determines that exactly one specified communication channel is available, it initiates the transfer of data or an index to the user device  114  via this communication channel. If more than one communication channel is specified, an order may of the communication channels may be given again. If the managing unit  124  determines that at least two specified communication channels are available, it selects the communication channel available with the highest order and initiates the transfer of data or an index to the user device  114  via this communication channel. 
     In this exemplary embodiment, the user may specify a direct radio connection as the communication for the transfer, for example. Then, the managing unit  124  initiates the transfer, when it determines that the radio connection is available. Thus, the transfer can be initiated automatically, when the host device  110  is brought into a distance from the user device  114 , which is in the range of the radio connection. Here, the automatic initiation of the transfer requires that the connection interface  118  of the host device  110  and the corresponding connection interface  120  of the user device  114  are active. 
     Furthermore, it may likewise be provided that the transfer is initiated by the user. This may be done by operating the input unit of the host device  110  or the input unit of the user device  114  in a predetermined way. If the data transfer is initiated manually by the user, one predetermined communication channel may be used for the transfer or multiple communication channels may be specified together with an order. In the latter case, the managing unit  124  select the communication channel according to the assigned order, if at least two specified communication channels are available. If only one specified communication channel is available, this communication channel is used for the data transfer. 
     Upon the initiation of the data transfer, the managing unit  124  checks, whether the memory card  102  connected to the host device  110  includes added data, i.e. data, which have not been transferred to the user device  114  yet. In case the files that have been transferred to the user device  114  are marked, the managing unit  124  checks, whether there are unmarked files stored in the memory card  102 . If the managing unit  124  determines that there are unmarked files, it selects the unmarked files for the transfer. If a register identifying the already sent data is kept, the managing unit  124  firstly determines the register allocated to the memory card  102  connected to the host device  110  as described before. Then, the managing unit  124  compares the files identified in the register allocated to the memory card  102  with the files stored in the memory card  102 . If the managing unit  124  determines as the result of the comparison that there are files stored in the memory card  102 , which are not identified in the register, it selects these files for the data transfer. 
     If files stored in the memory card  102  have been modified after they have been transferred to the user device  114 , the files may also be selected for the data transfer. Here, the files already stored in the user device  114  may be overwritten by the modified files. In another exemplary embodiment, the modified filed may be stored in the user device  114  using a modified file name, which indicates that the files have been modified. The modification of the file name may be done by the managing unit  124  before transferring the data. Whether the files already stored in the user device  114  are overwritten or not, may be defined in configuration data stored in the host device  110 . In another exemplary embodiment, the user may choose between the two options for each individual modified file. This may be done using a user interface presented at the host device  110  or the user device  114 . 
     If files stored in the memory card  102  have been deleted after they have been transferred to the user device, the files may also be deleted in the user device  114  or they may be maintained in the user device  114 . If the files are to be deleted the managing unit  124  may generated a request for deleting the files, which is transferred to the user device  114  instead of the files. In the request, the files to the deleted may be identified using the identification code allocated to the files, the file name and/or the file size. Whether the files are deleted or maintained in the user device  144  may again be defined in configuration data stored in the host device  110 . In another exemplary embodiment, the user may again choose between the two options for each individual modified file. This may be done using a user interface presented at the host device  110  or the user device  114 . 
     After the files to be transferred have been selected, the managing unit  124  may instruct the sending component  122  to send these files to the user device  114  via the data connection  116 . In alternative embodiment, priorities may be assigned to data to be transferred via the data connection  116 . Here, the files stored in the memory card  102 , which are to be transferred to the user device  114 , may be assigned a lower priority. Thus they are sent only, if no other data having a higher priority are to be sent. Moreover, the transfer of the data stored in the memory card  102  may be interrupted, when other data having a higher priority are to be sent via the data connection  116 . The data transfer based on the priorities assigned to the data to be sent may be controlled by the connection interface  118  of the host device  110 . In this case, the managing unit  124  or the sending component  122  only assigns the lower priority to the data read stored in the memory card  102  that are to be sent to the user device  114 . Alternatively, the managing unit  124  may monitor the data traffic of the data connection  116  and may instruct the sending component  122  to transmit the data, if the managing unit  124  determines that no other data are to be transferred via the data connection  116  or that other data to be transferred via the data connection  116  have lower priority than the data stored in the memory card  102 . 
     In an alternative embodiment, the managing unit  124  generates an index of the selected files to be transferred, after the files have been selected. As described before, the index may specify the names of the files to be transferred. In addition, the types of the files and/or other information relating to the files may be specified in the index. After having generated the index, the managing unit  124  may instruct the sending component  122  to send the index to the user device  114 . Moreover, it may mark the files stored in the smartcard  112  as being identified in an index or it may add the files to the register allocated to the memory card  102  together with an indication that they are identified in an index. If the files are identified in the register using an identification code, the identification code may also be added to the file stored in the memory card  102 . In principle, the registration of the files identified in an index can be dispensed with. However, it allows for resuming a transfer after a possible interruption without sending the index again. 
     In the user device  114 , the receiving component  126  receives the index and the index may be presented at the display unit of the user device  114 . For instance, in the user device  114  all files, which are stored in the user device  114  and which have been received from the host device  110  may be reviewed using a file browser. When files have not been transferred to the user device  114 , but an index identifying the files has been received, the file specified in the index may be added to the file browser together with an indication that they have not been received in the user device  114  yet. 
     After the index has been sent to the user device  114 , the files themselves may be transmitted to the user device  114  if there is low data traffic on the data connection  116 . Here, the transmission is made with a lower priority than other data to be transferred via the data connection  116  as described before. However, the user device  114  may request one or more specific files indicated in the index. In this case, the requested files are transferred to the user device  114  with higher priority. The user device  114  may request a file, when it is to be used in the user device  114  essentially immediately, in particular when the user wants to open the file using the user device  114 . 
     After the files have been sent to the user device  114 , the managing unit  124  marks the files stored in the memory card  102  as having been transferred to the user device  114 . If a register identifying the files sent to the user device  114  is provided, the managing unit  124  records the transmission of the files in the register. For this purpose, the managing unit  124  may add to the register items an indication that the files have been transmitted to the user device  114 , if the register items have already been generated in connection with the transmission of an index. Otherwise, the managing unit  124  generates corresponding register items. In addition, the managing unit  124  adds identification codes to the files, if the files are identified in the register using such codes. 
     If identification codes are used for identifying the files in the register and the identification code has not been added to the files before, the managing unit  124  also adds the identification codes to the files. 
     In the user device  114 , the receiving component  126  receives the files and stores them in the memory of the user device  114 . In one exemplary embodiment, the managing unit  124  adds to the files an indication of the memory card  102  in which the files are stored. The indication may be introduced into the meta data of the files or may be added to the file name. Alternatively, the indication may be transmitted in addition to files. The receiving component  126  may access this indication and store the files according to the memory card  102 . Here, different file folders may be provided for different memory cards  102 . This allows the user of the user device  114  to identify the memory card  102  from which the files originate. If the indication is attached to the file in the meta data or in the file name, those folders can also be dispensed with, since the source memory card  102  can be identified by inspecting the file. If multiple host devices  110  are used with one user device  114 , the host device  110 , which sends the files to the user device  114 , may likewise be indicated similarly as the memory card  102 . 
     In one exemplary embodiment, the data transferred from the host device  110  to the user device  114  is encrypted in order to ensure a secure data transfer. The encryption may be made in the host device  110  using an encryption key, which is securely stored in the host device  110 . In particular, the encryption key may be securely stored in the SIM card  112 . The encryption of the data may be made in the sending component  122 . As an alternative, the SIM card  112  may encrypt the data using cryptographic functions implemented in the SIM card  112 . In addition, a digital signature may be generated using the encryption key and may be transmitted to the user device  114  to allow the user device  114  for checking the data integrity. 
     In the user device  114 , the receiving component  126  decrypts the data using a decryption key stored in the user device  114 . Then, the data are stored in the user device  114 . If a digital signature is transmitted from the host device  110  to the user device  114 , the user receiving component checks the digital signature and stores the data, if the digital signature has been verified successfully. 
     If it is provided to send an index to the user device  114 , the transmission of the index may be secured in the same way, i.e. the index may be transferred encryptedly and a signature may optionally be added. 
     In one exemplary embodiment, symmetric encryption may be used. This means that the decryption key corresponds to the encryption key. In another exemplary embodiment, the encryption key and the decryption key may form an asymmetric key pair. 
     In a further exemplary embodiment, the memory  106  of at least one of the used memory cards  102  is protected against unauthorized access, i.e. the unauthorized reading, writing and manipulating of data stored in the memory card  102 . This allows the user to securely store personal and/or sensitive data in the memory card  102 , which are only provided for personal use or for sharing with selected other persons. For protecting the memory  106  of the memory card  102 , the microcontroller  108  of the memory card  102  may provide a security logic controlling access to the memory  106 . The security logic of the microcontroller  108  permits accessing the memory  106  only after a credential has been provided and successfully verified. The credential may be code, such as a password or a PIN (Personal Identification Number), or a digital signature, for example. 
     The credentials, which are necessary for accessing the memory  106  of the memory cards  102  used with a host device  110 , may be securely stored in the host device  110 . Particularly, the SIM card  112  may store the credentials so that they are protected against unauthorised access by the security mechanism of the SIM card  112 . If more than one memory card  102  is used together with the host device  110 , the credentials allocated to the memory cards  102  are stored in the SIM card  112  together with the identification codes allocated to the memory cards  102 . 
     The credentials stored in the SIM card  112  are used for accessing the protected memory cards  102  used with the host device  110 . In particular, this means that the managing unit  124  requests the SIM card  112  to provide the credential allocated to a memory card  102 , when the managing unit  124  accesses the memory card  102 . The credential is passed to the memory card  102  and the microcontroller  108  of the memory card  102  checks the credential. After the microcontroller  108  of the memory card  102  has verified the credential successfully, it grants access to the memory  106  of the memory card  102 . Then, the managing unit  124  access the memory card  102  as described before in order to send data stored in the memory card  102  to the user device  114 . 
     In another exemplary embodiment, data stored in a memory card  102  may not be protected by a security mechanism of the microcontroller  108  of the memory card  102 , but data is stored in the memory card  102  in encrypted form in order to prevent that unauthorised third parties can read the data without permission. 
     For accessing the encrypted data stored in the memory card  102 , the host device  110  may provide a crypto component, which is coupled to the managing unit  124 . The crypto component may likewise be configured as a software application, which may be run on the microprocessor  110  of the host device  110 . In a further exemplary embodiment, the application is run on the SIM card  112  so that functionality for decrypting the data is provided by the SIM card  112 . 
     The crypto component communicates with the memory card  102  and reads data from the memory card  102 . If the read data are encrypted, the crypto component decrypts the data using a decryption key that is securely stored in the host device  110 . Preferably, only this decryption key allows for decrypting the data, and it is ensured that no copy of the decryption key exists external to the host device  110 . This guarantees that the data can only be accessed using the host device  110  of the card owner so that the data are reliably secured against unauthorised access. The decryption key for decrypting the encrypted data stored in the memory card  102  may be stored in the SIM card  112  of the host device  110 . In this case, the security mechanism of the SIM card  112  protects the decryption key from being accessed by third parties. 
     The crypto component may also provide functionality for encrypting data and for storing the encrypted data in the memory card  102 . When data to be encrypted are present in the host device  110 , either after the data have been generated in the host device  110  or after they have been transmitted to the host device  110 , the crypto component may encrypt the data and control the transmission of the encrypted data to the memory card  102 . After having stored the data in the memory card  102  in encrypted form, unencrypted copies of the data stored in the host device  110  may be deleted. The selection of the data that is encrypted and stored in the memory card  102  may be made by the user of the host device  110  using the input unit of the host device  110 . 
     The data may encrypted using an encryption key that is stored in the host device  110 . In one exemplary embodiment, symmetric encryption is applied. This means that encryption and decryption is made using the same key. In this exemplary embodiment, the data are encrypted using the cryptographic key, which is securely stored in the SIM card  112  or host device  110  and which is also used for decrypting the data. Here, the data can only be encrypted using the crypto component of the host device  110  or the SIM card  112 . When data from further devices are to be encrypted, these data are provided to the host device  110 , as described before, and the crypto component encrypts the data and stores them in the memory card  102 . 
     In further exemplary embodiments, asymmetric encryption is applied. Here, a key pair is provided comprising an encryption key and an allocated decryption key, which is different from the encryption key. The encryption key is used for encrypting the data, while the decryption key is used for decrypting the data. When asymmetric encryption is used, the encryption key may also be securely stored in the SIM card  112  and kept secret to other persons. Thus, the encryption of the data and the storage of the encrypted data in the memory card  102  are exclusively done using the crypto component of the host device  110  or the SIM card  112 , similar to the exemplary embodiment in which symmetric encryption is used. 
     The names of the files stored in the memory card  102  and the meta data of the files may not be encrypted. In this case, the managing unit  124  may select the files to be transferred to the user device  114  without involving the crypto component. Likewise, the index of the files can be transmitted to the user device  114  without utilisation of the crypto component. However, if an encryption of the file names and/or the meta data is provided, the managing unit  124  accesses the data stored in the memory card  102  via the crypto component, when selecting the files to be transferred and when generating the index. Moreover, for marking the files and/or for attaching identification codes the managing unit  124  may use the crypto component. 
     The files, which are transferred to the user device  114 , may be unencrypted so that they can be accessed without using the decryption key stored in the host device  110 . Thus, when transferring the files to the user device  114 , the managing unit  124  instructs the crypto component to decrypt the files. The decrypted files are then passed to the sending component  122 , which sends the files to the user device  114  as described before. 
     If the data are transferred to the user device  114  in encrypted form, this encryption may differ from the encryption of the data stored in the memory card. Particularly, different keys may be used to increase security. This means that the data are decrypted first in the crypto component before they are sent to the user device  114 . Then, they are encrypted again as described before in order to send them to the user device  114 . Each encryption is made using another key. 
     While exemplary embodiments of the invention have been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive; the invention is not limited to the disclosed embodiments. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. 
     In the claims, the word “comprising” does not exclude other elements or steps, and the indefinite article “a” or “an” does not exclude a plurality. A single processor or other unit may fulfil the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measured cannot be used to advantage. 
     Any reference signs in the claims should not be construed as limiting the scope.