Congratulations. You've been sucked in by the Sony haters, and their made up propaganda.
Where do I start...
Blu-Ray is not a Sony proprietary format. Google for BDA, it's almost every company under the sun (Microsoft and Toshiba aside...)
Betamax was just as proprietary as VHS was (which was owned by JVC), in the same way that SD Card is also a proprietary Panasonic/Sandisk format. Both are used outside their manufacturers, you can get endless other makes of Memory Stick and SD card, as you can readers and other hardware that accepts them. I have photo frames and a laptop that accept Memory Stick, neither are made by Sony..
You also got sucked in by the DRM thing. If you look at Sony products, they have typically LESS DRM than the competition. The current Walkman devices for example, play DRM and DRM-Free music just fine, no proprietary software needed to load music (drag and drop). Compare that to iPod and Zune, which are DRM to the hilt. Playstation3, very relaxed DRM, you can gameshare PSN purchses with upto 6 other users, it's got open standards like DLNA (no closed proprietary formats like the Xbox Extender), the PS3 also supports almost all codecs and open formats out there, Bluetooth controllers using open Bluetooth 2.1 spec, the Xbox supports Microsoft closed formats and very strict DRM.
Nice try at the FUD, buy you might want to try some research before making yourself look silly and uneducated.