I downloaded one PDF and looked at its properties. It says it was created with LuraDocument PDF v2.28. Googling, it is a product of LuraTech Imaging GmbH. Fo

I downloaded one PDF and looked at its properties. It says it was created with LuraDocument PDF v2.28. Googling, it is a product of LuraTech Imaging GmbH. Following that search leads to a link that redirected to Foxit. They have an enterprise PDF compression toolkit which clearly supports all the advanced compression schemes of PDF, but it is too rich for me: prices are not given, just a button to ask for a quote. There is a personal PDF tool for $129 but they don't make clear if it also supports their top quality PDF compression.