How can I remove PDF password?

Hi guys, I'm new here! Just wanna say hello and see if anyone can do me a favor.Recently I've got a really annoying problem at work. Some of my PDFs can not be copyed, edited or printed. I know that's because they're secured but how can I remove the password? Any idea to work out the problem?

 

seek permission from original author

 

but how can I find those original authors? It looks impossible

 

if you can view them then you have to get permission for a copy from the company admin or find a crack

 

Or you can try some password killers or checkers... it will be time-consuming but sooner or later they will find the password.

 

At your job..... Seriously? Are you stealing info? Last I record, businesses wouldn't allow anyone to try and remove security on their files ever.