Free version is useless

Hi,

It is explicitly mentioned in the plugin description that the free version puts a DEMO watermark over the content in the free mode.

A Pdfcrowd API license is needed to remove the watermark.

The trial API license:
— https://pdfcrowd.com/user/sign_up/?pid=api-trial2

The paid API license:
— https://pdfcrowd.com/pricing/api/?api=v2