I have discovered a web service called smallpdf (from Switzerland!) which offers serveral free PDF features. One can reduce PDF size, convert PDF to Word, PowerPoint, Excel and JPG and the other way around, split and merge PDFs as well as unlock password protected PDFs. In my test unlocking of PDFs protected (even with simple) open passwords was refused. However removing document restrictions did work well.
This free web service is an interesting alternative to some of the paid services of the Adobe Document Cloud.
The service uses the PDF Tools AG (also from Switzerland.provided by