a pdf file allows filling in informations (names, dates etc) and printing - but these informations are lost when saving the file

Hello.
 
I'm not sure this is the correct place to expose my problem ...
 
The following link is a on-line .pdf form from brazilian health authority in São Paulo State:
http://portal.saude.sp.gov.br/resources/geral/acoes_da_sessp/assistencia_farmaceutica/lme_ministerio.pdf
 
We must click in each field and fill in relevant informations (names, dates, drugs, health condition etc). After filling in & printing, this form is submited to above authority, which will then provide the requested drugs free of charge. Here we are talking about expensive drugs & very nasty diseases ...
 
This filling, printing and submiting must be repeated every month. But the "genius" who designed this .pdf file did something which blocks saving the file while keeping the filled-in informations. Very nasty indeed, we poor suffers must fill in the same informations every month ... I take this as an extra endurance test.
 
Will somebody guess what is hapenning here ?
 
Still better, is there a clever way to circunvent this inconvenient ? To let save this .pdf file not throwing overboard such informations, allowing them to be eventually edited next month ?
 
I'm open to solutions which would eventually ask using other softwares along its intermediate steps.
 
Thank you very much for your attention, and my best regards.
 
Dilermando