Viacom owner Sumner Redstone's signature has changed, and it has people talking

The 93-year-old media mogul is having his mental capacity and independent judgment challenged in an ongoing war for the control of Viacom by former friends and colleagues.

Legal battles are being waged in several states after Redstone removed Viacom CEO Philippe Dauman and several others from the Viacom board. (Redstone and his family are majority owners of Viacom through his privately held company National Amusements.) In return, the fired board members charge that Redstone is being controlled by his daughter, Shari Redstone, and challenge his mental capacity.

Now, new attention is being brought to Redstone's current signature.

As seen on a recent letter to his detractors, Redstone's John Hancock now appears as just a squiggly line.

See for yourself below: