Printer Controller PDF to Bitmap Security Preservation
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Solution Overview
Problem
When converting document files with security functions into bitmap data for printing, the security limitations are lost during the rasterization process, resulting in unsecured bitmap data that can be freely viewed, printed, and modified.
Innovation Solution
An image processing device and method that detects operation limitations from the original file format, converts the data into bitmap data, and sets up corresponding operation limitations for the bitmap data, ensuring security is maintained by using a detection unit, converting unit, and setup unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If document files with security functions are converted into bitmap data through rasterization, then the document can be printed and displayed, but the operation limiting information is lost during conversion
Solution Approach 1:
The patent applies preliminary action by detecting operation limiting information from the original document file before the rasterization conversion process. This allows the system to proactively identify security constraints and apply corresponding limitations to the resulting bitmap data, preventing information loss that would otherwise occur during conversion.
Solution Approach 2:
The patent introduces an intermediary mechanism that bridges the original document file and the bitmap data. This intermediary process detects operation limitations from the source file and transfers them to the converted bitmap data, serving as a mediator that preserves security information through the conversion process rather than allowing it to be lost.
2Productivity
If bitmap data is saved in the printer controller for later use, then printing efficiency is improved, but security is compromised because the bitmap data has no security function set up
Solution Approach 1:
The patent applies preliminary action by setting up operation limitations on bitmap data before the data is saved in the printer controller. This ensures that security functions are established in advance, preventing unauthorized access or modification of the stored bitmap data while still allowing efficient retrieval and printing operations.
Solution Approach 2:
The patent applies preliminary anti-action by proactively preventing unauthorized operations on bitmap data through operation limitations. By establishing security constraints before the bitmap data can be misused, the system counteracts potential security threats in advance, allowing the bitmap data to be stored and reused without compromising security.
3Device complexity
If operation limiting information is removed during rasterization, then the conversion process is simplified, but the security function is destroyed
Solution Approach 1:
The patent introduces an intermediary detection and transfer mechanism that operates during the rasterization process. This intermediary component identifies operation limiting information in the original file and ensures it is preserved and applied to the bitmap data, maintaining security functionality without significantly complicating the overall conversion process.
Solution Approach 2:
The patent applies preliminary action by detecting and preserving operation limiting information at the beginning of the conversion process. This early detection ensures that security information is captured before conversion proceeds, allowing the system to maintain security functions while keeping the conversion process relatively simple through targeted information preservation.
Data Source
AI summary
The printer controller as an image processing device detects the information that indicates a limitation on an operation related to a PDF file from the file, and converts the PDF file into bitmap data. Furthermore, the printer controller sets up the operation limitation related to the bitmap data for the obtained bitmap data in accordance with the detected information.