Just noticed the “Pc.de New Fonts” submitted by erielarsonor: http://openfontlibrary.org/media/files/erielarsonor/428
erielarsonor says “The PC.DE typeface is a free-to-use sans-serif font from serious font family […]” and has published it as OFL. Something about the description made me follow the link (http://pc.de/fonts/), where I saw nothing of a free license, downloading the archives resulted in no such information as well. The font file ‘PC DE-Bold.otf’ for instance has the following copyright notice: “© 2009 PC.DE © 2009 by Sergiy S. Tkachenko / 4th february (foundry4...@gmail.com). All rights reserved. This font software is the property of Sergiy S. Tkachenko (Kremenchuk, Ukraine). You may not reproduce, modify, adapt, translate, alter nor create derivative works of the font software. You may not reverse engineer, decompile, decrypt, disassemble, nor seek to discover the source code of the font software.” In the end I haven’t looked any further or made any inquiries, so I do not know whether this font belongs on the OFLB site or not. Sent this quick email in case anyone wishes to check this up more closely. ~ Kess