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There is only one edition of
Malwarebytes Anti-Malware which you can use to scan and remove security threats in your PC. However, the vendor of MBAM still needs to pay their bills (dedicated server, developer software, etc.) and staff which makes the software a great program and continues to provide free anti-malware to home users or for personal use.
The free edition of MBAM receives free database updates to detect new types and variants of malware. Imagine how expensive it is to support the number of downloads per day for the installer and the detection signatures for MBAM. It surely costs a lot so the maker of Malwarebytes decided to offer different license types: Free, commercial and corporate.
MBAM is safe because it is not required to register for a license unless you are going to use MBAM in a business or corporate environment. You can also register a license for MBAM even if you are a home user and by registering MBAM you'll enjoy the real-time protection, scheduled scanning, updating and fast support. See the image at the left on available on-access protection in MBAM.
Free users of Malwarebytes enjoy the free license in using the program to manually scan and remove malware but for personal use only. Commercial license users of MBAM or the registered edition of MBAM receive a lifetime license which means they won't be receiving additional charges in using the program. It's a one-time fee ($24.95). Business or corporate users are the ones that need to pay an annual license fee.