Vijay's next film directed by Siddique was fast progressing under the title 'Kaavalkaran' and few days ago the news was there announcing the change of title to 'Kaaval Kadhal'. In fact it was only after Asin spoke to the media from Srilanka everybody came to know of the change.
Now you know the reason for the change. 'Kaavalkaran' was an ever green super hit film of MGR produced by Sathya Movies founded by R M Veerappan. That was the very first production venture of the illustrious production house.
After hearing that a Vijay's film is using one of their ever popular title Sathya Movies wrote an objection to the producer council. The objection was conveyed to Siddique and eventually the title was changed.
According to production council rules if anybody wants to re-use an old film's title the act has to be officially approved by the producer of the original film.