>>30Monapo is not very good for accuracy, try looking at vertical lines on larger AA. And Mona is missing a lot of important unicode characters.
If you want accuracy and don't want to use Microsoft fonts, use IPAMonaPGothic. Be careful though, you need the version with embedded bitmaps and many of the copies circulating online seem to be broken in that regard (the copy on the AAHub site in particular seems broken).
There's also Saitamaar (fonts.aahub.org/font/6/) which is about as accurate as an AA font can get (it's a vectorization of the IPAMonaPGothic 16px bitmaps) but it gets some rather ugly color fringing due to subpixel rendering if you're on Windows. I've added embedded bitmaps to my copy of it to avoid that.
One thing of note, typefaces are not covered by copyright in the United States (see Section 906.4, Compendium of U.S. Copyright Office Practices), nor are most typefaces patentable. What IS covered by copyright is the "software" component of a font. Which is to say, hinting and vector outline information. To the best of my understanding, a bitmap font is not considered software and as it is a mere representation of a typeface, is thus not copyrightable (this may be a bit of a legal grey area as far as redistribution goes).
It is fully legal to recreate a typeface as long as you are doing it manually and independently of the original font files. If you print out a font and trace it again by hand, or recreate the bitmaps manually, you have effectively avoided any font licensing issues. ;^)