There’s a newly-mature free PDF reader, PDF-XChange Editor which has just had an excellent TechRadar review. Sounds interesting but I cancelled my download halfway, immediately after reading…

“You can try any of these “Protected” features [buttons for features in the paid-for version] but, be very careful not to save your PDF if you do not want the watermarks to appear in the upper corners of each page in the document. Once a document is watermarked, there is no way to remove them without a license”.

Ugh. Sounds to me like the free version is effectively a form of ransom-ware, activated by the user’s curiosity and tiredness.