What are the restrictions on NTFS and in what ways can I use NTFS?
Can I boot from NTFS without worrying about Microsoft suing me?
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Unlike with its ExFAT filesystem and VFAT filesystem extensions, Microsoft has chosen not to issue any patents regarding NTFS, so there's no need to obtain a licence from Microsoft to use it. The particular "invention" of a boot sector is much older than NTFS, and even Microsoft itself, and so wouldn't have been patentable by them in any case.