Use the PreMark™ page in the PreEmptive Protection™ DashO™ user interface to add a watermark string to the JAR files DashO produces. Read the watermark later with the PreMark command line utility.
To learn how watermarking works, see Watermarking.
Prerequisites
- A DashO project in Standard Mode. The PreMark page is only available in Standard Mode.
- DashO output configured as JAR files. The page is disabled when DashO outputs to a directory or an APK.
Add a Watermark
- In the navigation tree, select PreMark.
- Enable Watermark Jar.
- In Character map, select the character set for your watermark.
- In Watermark, enter the watermark string. Use only characters in the selected character map.
- In On overflow, choose whether DashO truncates the watermark or halts the build when the watermark doesn't fit.
- (Optional) In Passphrase, enter a passphrase to encrypt the watermark.
- Save your project and build it to apply the watermark.
- (Optional) Read the watermark from an output JAR file with the PreMark command line utility to confirm it.
Note: If DashO creates multiple JAR files, it adds the same watermark to all of them.
PreMark Settings
| Setting | Description |
| Watermark Jar | Enables or disables watermarking. |
| Watermark | The watermark string DashO applies to the JAR file. The selected Character map determines which characters it can contain. |
| On overflow | What DashO does if the watermark is too long for the JAR file: truncate it and continue, or halt the build. For more information, see Overflow Behavior. |
| Character map | The character map DashO uses to encode the watermark into a minimal set of bits. |
| Passphrase | An optional passphrase DashO uses to encrypt the watermark before it applies it. |
Examples and Use Cases
| Goal | Settings |
| Add a copyright notice to every JAR file | Watermark Jar selected, the notice in Watermark, and a Character map that contains its characters. |
| Make sure the build fails rather than cutting the watermark short | On overflow set to halt the build. |
Limitations and Troubleshooting
| Issue | Resolution |
| The PreMark page is unavailable or disabled. | Use Standard Mode, and output to JAR files instead of a directory or an APK. Watermarks aren't supported for Android. |
| The build fails because the watermark doesn't fit. | Shorten the watermark, choose a smaller Character map, clear Passphrase, or set On overflow to truncate. |
| You need a different watermark for each copy. | This page applies the same watermark to every JAR file. Use the PreMark command line utility. |