A platform (1) comprises a client device interface (5) is for communication with devices operated by students, in this case software students. The client device interface (5) comprises an XML web server (6) for method calls from client devices (7). The platform (1) also comprises a content interface (10) which is linked with a content database (11). Between the interfaces the platform (1) comprises a distribution mechanism (25) having a real time clock for controlling distribution of content to client devices (7). A decision mechanism (30) automatically controls access to content, and a synchronization controller (32) manages a group of platform synchronization tables (33). There is no need to download content every time a particular client device (7) accesses the platform (1), as automatic synchronization of the tables at the platform and client ends ensure full access control to content remaining on the client device (7). If a student requests access to content using a different client device there is again synchronization and access can continue as if the same device is used, after the content is downloaded and decrypted.