Key from Humble Bundle. Regional restrictions on key to following regions (looks like EU-countries, excluding Germany): AD, AL, AT, AX, BA, BE, BG, BQ, CH, CS, CY, CZ, DK, EE, ES, FI, FK, FO, FR, GB, GE, GF, GG, GI, GL, GP, GR, GS, HR, HU, IE, IM, IO, IS, IT, JE, JE, KY, LI, LT, LU, LV, MC, MK, MQ, MS, MT, NC, NL, NO, PF, PL, PT, RE, RO, SE, SH, SI, SJ, SK, SM, TC, VA, XK, YT.