Keyloggers

Are they legal? I need the one for parental control purposes, I'm planning to install it on my younger sister's laptop.

 

Not legal, atleast not here that's for sure.

 

In general they're legal, however in case of certain countries I recommend you to check local laws for being totally sure. Also despite the certain countries it really depends on for what purposes you're planning to use this software.
If that's only for your personal needs or as a part of parental control software, than it's definetely ok. Keylogger software is based on recording all keystrokes made on a computer or other gadgets and because of that you can get access to all information connected with certain users (like web searching, e-mail, social media activities and so on). Because of that keylogger www.refog.com is often used for monitoring children gadgets activities and blocking all possible inappropriate content for them. And yeah, for such parental purposes it's totally legal.
It could be considered illegal only if you use it for adults without their permission, never do that because it's a popular practice of scammers for stealing personal information and you'll get troubles with the law blogs.findlaw.com/blotter/2017/07/can-i-be-arrested-for-installing-keylogging-software.html .

 

Depends. If the said sis is not a kid she can sue OP for breach of privacy and stalking. Not to mention get a Protection Order if things really go south.

 

Kind of morally wrong too.

 

You could install some parental control like karpersky

 

I went ahead and googled that for you; and this site explains it well: Is Keylogging Legal? | Kids Cell Phone Monitoring Issues | Pumpic Blog