There are no fonts installed on a user's hard drive.
In spite of all this, the application is absolutely free, but it may ask you for an installation license. Before using the program, be aware of the following, too.
First, the free version of Dia may include some advertisements. That's the same thing that happens to the full version. So, you should plan ahead, that is to say, if you don't like such commercials, you must pay for an additional license 50e0806aeb markcol
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