I locked the document with Acrobat password and did not provide the document for printing or modification. The https://www.ilovepdf.com website provided the password cracking function to the public, which violated my document protection.

My colleague took the file I password-protected with Acrobat and went to Unlock PDF on the https://www.ilovepdf.com website, and got a file that was completely unprotected by password and can be edited at will. Moreover, this website provides Unlock PDF to any user without any charge. I am very angry. I paid for the password protection feature in Creative Cloud and the website https://www.ilovepdf.com was compromised.