Python code SRD GUI (.py format)

The GUI is a Python-based program [see Appendix/Supplementary] that performs two primary functions: 1. Selective: This mode enables the selection of relevant files from the entire directory that are applicable to the specific supplier. 2. Restricted: This mode offers an optional feature to embed watermarks on each page of PDF and Microsoft Word files and modifies all file names in the directory by appending the watermark text as a suffix.