This function allows the user to Copy text from a PDF which has Visual-Meta attached and then Paste into a Visual-Meta aware word processor since the clipboard payload includes the Visual-Meta and thus the BibTeX formatted citation information which the software (usually a word processor) pasted into can turn into a Citation. This means that the citation will be correctly formatted on export and the sources added automatically to the References appendix on export to PDF.
This workflow works for citing while reading and also when using a Reference Manager (RM) since the RM can open the PDF to allow for citing.
The user can also simply Copy when the PDF is open, to copy as citation without quoting specific text.