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Sometimes you will likely create documents that you do not want unauthorized people to read.
If you protect these documents with a read password and/or a write password, they can only be viewed and/or edited if one knows the password.
You can protect documents in this way with TextMaker, PlanMaker and Presentations alike. Choose the command File | Properties and go to the Protection tab.
You can read more about protecting documents in the documentation:

Document protection in FreeOffice TextMaker

Document protection in FreeOffice PlanMaker

Document protection in FreeOffice Presentations