My registered PDF Password Recovery program (5.06.113) will not let me copy any PDF content, it just says the document is not encrypted.
If ElcomSoft Distributed Password Recovery doesn't allow you to copy content, then it means the PDF files are protected. There is no need for them to be encrypted but protected against copying. Luckily, there are plenty applications developed for such operations. You can either use an online service or a dedicated application to remove the copy protection then you can access the content.
Here is an offline solution: