Useless dependency in specific usage

In class org.apache.pdfbox.pdmodel.interactive.digitalsignature.visible.PDVisibleSignDesigner line 324 you use Arrays.clone() method from BouncyCastle.

This creates a dependency on BouncyCastle if we try to add a visual signature (computed by third party solution) to a pdf document.
For this specific usage this dependency seems useless and could be avoided using the copy method of the class java.util.Arrays.

Could you fix this issue in a future version ?