Unable to access data from external drive

Hello! I was working for an organization which I left last year. Before leaving, I have transferred all the data from my company's laptop to my external drive. After an year, when I tried to access them, everything seems to be inaccessible. Later, I realized that this is because of dell encryption software in the previous company that has encrypted all the data. Since I left that organization, is there a way I can still decrypt that data? I can't access photos, videos, PDFs - everything is encrypted. Any help is appreciated!!!