How can protect my pdf from smallpdf.com

[leean0601]

Hello. Im trying to figure out how can i protect my PDF from smallpdf.com

This page erase your password and let you edit the pdf file.

I dont wanna my PDF editable, because my work and work from all designers worth!

Thank you very much and sorry for my english.

[Joel Geraci · Accepted solution]

Use Certificate Security instead of a password and be sure to set it to 256-bit AES. smallpdf.com can't remove that type of security.

[leean0601]

Hello, i have alot of work, and i cant response this thread. Im sorry.

I try whit Security Certificate but i have to add some users... i don't understand this function. Do you have any tutorial ? Thank you!