AssSubtitleModel assfile = Lib.AssParser.ParseAssFile(@"path/to/your/assfile").Result;

# Or async way

AssSubtitleModel assfile = await Lib.AssParser.ParseAssFile(@"path/to/your/assfile");

AssSubtitleModel assfile = Lib.AssParser.ParseAssFile(@"path/to/your/assfile").Result;
FontDetail[] fonts = assfile.UsedFonts();

public class FontDetail : IEquatable<FontDetail?>
{
    public string FontName = "";
    public string UsedChar = "";
    public int Bold;
    public bool IsItalic;

    public override bool Equals(object? obj)
    {
        return Equals(obj as FontDetail);
    }

    public bool Equals(FontDetail? other)
    {
        return other is not null &&
               FontName == other.FontName &&
               Bold == other.Bold &&
               IsItalic == other.IsItalic;
    }

    public override int GetHashCode()
    {
        return HashCode.Combine(FontName, Bold, IsItalic);
    }

    public static bool operator ==(FontDetail? left, FontDetail? right)
    {
        return EqualityComparer<FontDetail>.Default.Equals(left, right);
    }

    public static bool operator !=(FontDetail? left, FontDetail? right)
    {
        return !(left == right);
    }
}

AssSubtitleModel assfile = Lib.AssParser.ParseAssFile(Path.Combine("UUEncodeTest", "1.ass")).Result;
string fontsData = assfile.UnknownSections["[Fonts]"];

byte[] data = UUEncode.Decode(fontsData, out var crlf);
string encoded = UUEncode.Eecode(data, crlf)