Who are the third parties in this context?;

"The denial of the persecution of the Jews also differs in this respect from the denial of German war guilt (see BVerfGE, decision of the 11th January 1994 - 1 BvR 434/87 (BVerfGE 90, 1)). The last named opinion, apart from being historically dubious, does not in anycase interfere with legal interests of third parties."