From Humble Bundle.

Will not activate in: AE, AF, AL, AM, AO, AR, AZ, BD, BH, BI, BJ, BO, BR, BT, BW, BY, CD, CF, CG, CI, CL, CM, CN, CO, CR, CU, DO, DZ, EC, EG, EH, ER, ET, GA, GE, GF, GH, GM, GN, GQ, GT, GW, GY, HK, HN, ID, IL, IN, IQ, IR, JO, JP, KE, KG, KH, KM, KP, KR, KW, KZ, LA, LB, LK, LR, LS, LY, MA, MD, MK, ML, MM, MN, MO, MR, MW, MX, MY, MZ, NA, NE, NI, NP, OM, PA, PE, PH, PK, PR, PS, PY, QA, RS, RU, RW, SA, SD, SG, SL, SN, SO, SR, SS, SV, SY, SZ, TD, TG, TH, TJ, TM, TN, TR, TT, TW, TZ, UA, UG, UY, UZ, VE, VN, YE, ZA, ZM, ZW