It can be very difficult and risky from a legal and security standpoint to access Putlocker movies safely when the site is blocked. Since Putlocker is an unofficial platform that regularly changes domains, it is very easy for users to be deceived by fake or malicious clones. Applying stringent security measures such as activating an ad blocker, regularly updating a computer's antivirus program, and staying away from suspicious links can go a long way in minimizing the risk. However, since these kinds of sites generally host or provide access to unlicensed content, the safest way would be to opt for genuine, licensed streaming services which besides ensuring secure access also offer consistent quality, and are fully compliant with copyright laws applicable in your region.