I recently purchased a 100 seat license of "Advanced PDF Compressor" ($600.00) unfortunately after 6 installs all licenses were used up. I called the vendor both sales and tech support with no reply. I also emailed the website that handled the transaction and they indicated that I needed to go through the vendor.
I was very pleased with the software during the testing phase as it took a 20MB .pdf and shrunk it to 865K and file was very readable.
So now I will rely on the experts to guide me to a software package or method that will compress .pdf files. Looking for a drag and drop process if possible.