| 摘要 |
A dynamic watermarking capability is implemented in an enterprise rights management (ERM) or similar system that comprises a central server to which end user client machines are connectable. The central server has a database in which watermark definitions created by authorized entities are centrally stored. An end user client machine is provided with a client component that typically includes wrapper code, and watermarking rendering code. The wrapper and rendering code are instantiated when a given calling application is started, or when the application initiates a given rendering function such as a print or display operation. When the calling application begins the rendering operation, the wrapper code intercepts a given rendering function call, connects to the central server and then retrieves a watermark definition. Alternatively, the watermark definition is retrieved when a document to be rendered is first accessed on the client machine. The watermark definition is then applied by the watermark rendering code, preferably using local rendering resources.
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