We found one dictionary that defines the word proprietarially:

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1. proprietarially: Wiktionary

Definitions from Wiktionary (proprietarially) ▸ adverb:  In a proprietarial manner. ▸ Words similar to proprietarially ▸ Usage examples for proprietarially ▸ Idioms related to proprietarially ▸ Wikipedia articles (New!) ▸ Words that often appear near proprietarially ▸ Rhymes of proprietarially ▸ Invented words related to proprietarially