I am basically asking how to find the sources needed to build a document without using Maven and without BouncyCastle.
The main page indicates that BouncyCastle is optional. Since I will not be writing PDF files, I have no need to sign the created documents. Therefore, I should have no need for BouncyCastle.

I tired to build only the openpdf/src/main/java/com/lowagie/text/ portion of the source tree, but even that seems to reference bouncycastle stuff. Is BoundyCastle really optional?

I looked at the pom.xml where it says I should use version 1.78.1, but I do not find such a version when looking there. Guidance here would be appreciated.