Dynamic Expressions are a powerful tool to display informations in layers or influence layer properties. These informations are not available until a photo is protected by bulkWaterMark and are getting extracted from the input image data, the internet, your computer or other sources.
You can use camera metadata from the original photos for example and display in a Text Layer if the flash was activated when taking the picture. To display these kind of informations in Text Layers we developed a special language called Dynamic Expressions. By using expressions, bulkWaterMark can differentiate normal, static text from dynamic text. bulkWaterMark understands exactly what you want to display in the Text Layer and translates the expression in to a human-readable, understandable text.