| 摘要 |
<p>A system of operating a database server (20) adapted to provide on-line publications to a plurality of subscribers. The database server (20) maintains a schedule of events file relating to predetermined downloading schedules to the subscribers (26) desiring a corresponding publication. Each subscriber (26) sends request based on the schedule events file along with a list of existing files in the subscriber's database including file names, file sizes and corresponding file CRC codes. Database server (20) then transmits to the subscriber a set of authorized data files by a publisher (24), including each file name, size, and CRC code in response to the request from each subscriber (26). Database server (20) calculates the CRC code of a portion received by the subscriber and it is compared with calculated CRC of the portion of the file received from the subscriber (26).</p> |
