Access PDF Security properties without opening files?

I have a document library of around 12,000 files which will be sold through a document delivery website. To counter copying etc. we are using a PDF Stamper program to individualise documents at purchase.

Our problem is that we have been supplied a mix of Password Protected and not Protected files.

Is there a way (or a utility) that can scan the library and report which documents are so Protected?

Many thanks.

Brian