Digital technologies enable a "tinkering culture" where people can easily borrow, copy, and manipulate content. This makes it technically easier for people to express themselves creatively. However, this clashes with a culture of intellectual property where permission is required to use or copy copyrighted works. Copyright automatically protects "creative and expressive works" for the life of the author plus 70 years. There is ongoing controversy around whether the duration of copyright exclusivity balances promoting innovation with allowing public use of works.