This license is only used on the media-sound/gsm package, and it is straight from the COPYRIGHT file in the gsm sources. It may very well be an OSI approved license, but I dont think it should actually be named OSI-Approved. Reproducible: Always Steps to Reproduce:
+ 10 May 2009; Samuli Suominen <ssuominen@gentoo.org> gsm-1.0.12-r1.ebuild: + Rename license from OSI-Approved to gsm wrt #240392 Done, and confirmed by grepping entire gentoo-x86 cvs tree that nothing else is using it.