Anurag Basu plans to make two biopics on Bihar's globally celebrated mathematician Anand Kumar and legendary playback singer Kishore Kumar respectively. The director says "a legal letter of consent" from the respective families is a must before starting the projects.

"I first need signatures on legal documents authorizing me to make films on these two very different and dynamic people. I need to have a letter of consent from Anand and Kishore-da's families. Luckily for me, both the parties are more than happy to have me making films on Anand and Kishore-da.

"Still, there is a great deal of legality and research to go through. No producer would touch a biopic without a legal letter of consent authorizing me to make the film."