First of all, PutLocker is the internet site which uploads films or net series with none rights over it that is not criminal. So, it is not felony to watch and download movies from sites like these. As they violate many DMCA guidelines and don't have any copyright of the content material. Also, It is not a non-virus website.
But nonetheless, you don't should worry about it. Because there are a variety of web sites wherein you can watch new movies or net series with none copyright violation. Also, these web sites buy the copyright of the content material from the Owners.