My ISP Bahnhof here in Sweden was ordered the same thing. They decided to block Elsevier web properties as well for good measure.

I am working on a piece of software that produces PDF documents as end result. PDF documents that customers need to have accessible for a long time due to regulatory needs.

Our problem with PDF/A is that different preflight tools give different results and we therefore find it hard to claim compliance with the standard.

Unfortunately, the ISO PDF/A standard was ambiguous in several parts - particularly the XMP metadata requirements. I have heard the PDF/A Competence Center is working on an extensive PDF/A test suite for preflight programs. This will hopefully avoid the differences in preflight results from the various applications.