The best replacement for proprietary is confidential.

The best alternatives to proprietary are rated as following:
★★★★★  confidential
★★★★★  open source
★★★★  open source software
★★★★  contract security
★★★  non proprietary
★★  open standards
★  proprietary
★  budgetary
  generic
  commodity
  royal
  open source cms
  royal colonies
  intellectual property
  open source databases
  semi proprietary software instead of free software
  patent medicines
  nonproprietary
  generic memory

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Google Trends

Scale is based on the average worldwide traffic of proprietary in all years. Click on graph for more.
proprietary
confidential
open source