Abstract: The invention relates to a method and an arrangement for upgrading a target device via a wireless connection. Upgrade is executed by exploiting a wireless personal communications device (101) as a gateway between the content provider server (104) and the target device (102). A DRM scheme may be applied to said method for limiting the usage of transmitted content. The content may be encapsulated in a SMS or MMS message. A wireless personal communications device (101) capable of executing the presented method can be used e.g. as a personalization tool for downloadable sounds to be reproduced by a target device (102) such as a toy.

Abstract: According to a first aspect of the invention metadata between user data items and software data items is maintained. The utility of at least one user data item is determined on the basis of the properties of one or more software data items related to the user data item in the metadata. The user data item and one or more software data items related thereto are selected to the data set for synchronization in response to the utility of the user data item meeting a predetermined criterion.

Abstract: The invention relates to a method of detecting duplicates in a synchronization system comprising at least one client device and at least two synchronization servers. The method comprises the steps of allocating first identifiers to the data units to be synchronized for use in the client device and second identifiers for use in the synchronization server; maintaining mapping tables for the synchronization servers by adding to the mapping table first identifiers and second identifiers allocated to the data units to be synchronized via the synchronization server. The method further comprises the steps of comparing the identifier pairs formed by the first and second identifiers added to the mapping tables of different synchronization servers; and causing at least part of the identifier pairs of the mapping tables to correspond to each other.

Abstract: A method for selecting a data set to be synchronized from databases of a data system, in which system metadata illustrating the relationships between data units of the data system are stored for the selection of the data set to be synchronized. The metadata comprises at least information on the relevance between the data units. When a first data set is to be synchronized, metadata associated with at least one initial data unit of the first data set is retrieved. Next, a second data set, which according to at least one metadata element comprises a data unit of maximum relevance to the initial data unit, is selected for synchronization.