* Put the player into Standby mode
* Press 1 and Return on remote for region 1, 2 and Return for region 2, and so on. Use 0 and Return to return player to default region settings
* Press P-Mode and Return to play DVD's with the selected region, auto-switching is Off
* Press Audio and Return for auto-switching On
* Press Angle and Return for MacroVision On
* Press Subtitle and Return for MacroVision Off
I don't have a Sony so can in no way vouch for the effectiveness of this procedure.