Shimon; that shitah is a daas yochid. See Shevet Halevi 4:202 Practical Laws of Money p. 117 cites a letter from Rav Karelitz, Rav Elyashiv, and Rav Wosner. Quotes Emek Hamishpat 4 (quoting Rav Nissim Karelitz) as holding that it is forbidden buy illegal software.
Igros Moshe 4:40:19, Rav Elyashiv (Mishnas Zchiyos Hayotzer ch. 18, Emek Hamishpat), Teshuvos Vhanhagos 1:829, Netsiv in Meishiv Dvar 24, Minchas Yitzchak 9:153
Rav belsky is quoted in piskei halacha as holding that it’s assur, as I have also heard it mi’peh kodsho personally