This interview with Emma Watson and Rupert Grint was filmed shortly after the first film in the Harry Potter franchise had premiered in 2001 - Harry Potter and the Philosopher´s Stone.

For all Americans wondering why I wrote "Philosopher's Stone" and not "Sorcerer's stone":
"Philospher's stone" = The original, British title.
"Sorcerer's stone" = The American title.
The title change was proposed by J. K. Rowlings American publisher, since they were concerned that Americans would not understand what a Philosopher is, given that it isn't the same in American English. This has, however, led to criticism as some argue that the title change might have been insulting to Americans.
Rowling initially opposed the idea.