It used be the case, possibly still is, that free downloadable fonts can be of uncertain quality in terms of line and character spacing. They may also lack extended characters; we Europeans often find the euro symbol missing, for example. I'm not condemning all downloadable fonts out of hand, just drawing attention to some problems that they may introduce.
Apache OpenOffice 4.1.1 on Xubuntu 15.04 (mostly 64 bit version) and Win2K/XP
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