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Several Mac users are Watch Woman in Her 20s Who Has Luscious Matured Curves Onlinecomplaining about getting locked out of their computers for a bitcoin ransom.

MacRumorsfirst reported the trend, apparently by mysterious hackers. Here's what's going on, according to Apple. Find My iPhone allows you to remotely lock one of your devices.

These hackers have obtained access to a bunch of iCloud usernames and passwords, and are using them to remotely lock people's computers. The hackers are demanding, in chatspeak, a $50 bitcoin ransom in exchange for unlocking the devices.

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If this happens to you, you'll have to bring your computer into an Apple Store and verify your identity to regain access to it. Otherwise, the only ways to get back control of your machine is to perform a hard reset (which would mean losing all the data) or pay the hackers and pray.

But the fact that these lock-outs are occurring at all points to a broader problem -- that hackers were able to gain access to a number of people's usernames and passwords, whether through phishing scams, fake virus alerts, or people using weak passwords. This ransomware underscores the importance of creating a secure, unique password that's difficult to hack or guess. Here's some good advice on that.

If you haven't been hacked yet, you may want to turn off Find My Mac for your Mac computers. And be sure to enable two-factor authentication on your Apple account.