Extracting Watermarks from Documents

Prerequisites

• OBS asset access permissions are granted. For details, see Allowing or Disallowing Access to Cloud Assets.
• OBS has been enabled and used.
• The file format is PDF, PPT, Word, or Excel.

Constraints

• This section focuses on the extractions of invisible watermarks from a single PDF, PPT, Word, or Excel file.
• The maximum size of a PDF or Word file is 50 MB.
• The maximum size of an Excel file is 70 MB.
• The maximum size of a PPT file is 20 MB.

Creating an OBS Bucket File Watermark Extraction Task

1. Log in to the management console.
2. Click in the upper left corner and select a region or project.
3. In the navigation tree on the left, click . Choose Security & Compliance > Data Security Center .
4. In the navigation tree on the left, choose Data Asset Protection > Document Watermarking. On the displayed page, click the OBS File tab.
5. Click the Watermark Extraction tab. The Watermark Extraction page is displayed.
6. Click Create Task in the upper left corner. The Create Task page is displayed.
   Figure 1 Creating a watermark extraction task
   

7. Click Add File to select the file from which you want to extract watermarks. You can select multiple OBS bucket files.
   Figure 2 Selecting a file
   

8. Click OK. The watermark extraction task is created.
9. Click next to the target task name to view the extracted invisible watermark content.
   Figure 3 Invisible watermark
   

Extracting Watermarks from Local Files

1. Log in to the management console.
2. Click in the upper left corner and select a region or project.
3. In the navigation tree on the left, click . Choose Security & Compliance > Data Security Center .
4. In the navigation tree on the left, choose Data Asset Protection > Document Watermarking. On the displayed page, click the OBS File tab.
5. On the displayed page, choose Local > Extract Watermark. The Extract Watermark page is displayed.
   Figure 4 Extracting watermarks
   

6. Upload the local file from which you want to extract the watermark text.
   

   Only PDF, PPT, Word, and Excel files are supported.

7. After the file is uploaded, click OK. The invisible watermark content is displayed in the dialog box.

Related Operations

Click next to the target watermark injection task name to view the status of the watermark extraction task.

• Running: You can view the progress of the watermark extraction task.
• Completed: The watermark content is displayed in the Invisible Watermarks column. If there are no invisible watermarks, -- is displayed.
• Failed: The watermark extraction task fails to be executed. You can move the cursor to to view the failure cause.