[ben0x539]

All of these have implementations available under free software licenses so they are clearly and objectively not proprietary.

Trademarks are annoying but I can hardly imagine they're what anyone is worried about when picking a language in this context, they're not what's going to cause a language to disappear.

[torstenvl]

That's completely nonsensical.

[zahlman]

No; that's what the word "proprietary" means as applied to software.

[anonymars]

Care to elaborate?