As you certain? There seem to be references to a Tibetan version.
There is another text called Brahmajala-sutra (Brahma Net Sutra), but it isn't the same as the Chinese Mahayana text Fanwang-jing 梵網經. The later borrows a lot of elements it seems from the Buddha-avatamsaka-sutra (Huayan-jing; Flower Ornament Sutra).
I have access to several university libraries and also the Library of Congress is down the street (well, really across the city).
Cool! Then you can probably find a lot of quality materials for your research.
That's unfortunate. The sutra seems to assert that the awakening of one's Buddha Nature is dependant upon practicing the Bodhisattva Precepts.
The one thing that I find really intriguing is the statement that Vairocana's teachings are taught and studied by the Buddhas and Bodhisattva's of the past, present and future.
《梵網經》卷2：「是過去一切佛已說。未來佛當說。現在佛今說。三世菩薩已學當學今學。」(CBETA, T24, no. 1484, p. 1003, b11-13)
Now, here are Fazang's comments regarding this:
1. The Dharma responds as such.
These three sets of pure precepts of the Bodhisattvas are the direct route to the site of enlightenment and the perfect cause for omniscience, therefore all the Buddhas manifesting in the world to benefit beings all rely on this ancient Dharma.
The Dharma being such: the first time one binds oneself to the Bodhisattva prātimokṣa is a requisite for the [ascertaining of the] origin of truth.
Like the Great King’s Way – the law being such, it is always regulated, so it must be explained.
《大方廣佛華嚴經疏》卷18〈15 十住品〉：「今初。謂三世佛果無不由此。十住因成。如大王路法爾常規。故同說也。」(CBETA, T35, no. 1735, p. 635, a9-10)
Thus it is stated below, “Each sit under the Bodhi tree and recite my original teacher’s precepts.”
《梵網經》卷2：「各坐菩提樹誦我本師戒」(CBETA, T24, no. 1484, p. 1004, a8-9)
Again it is said, “This Vairocana recites. I too recite it like this.”
《梵網經》卷2：「是盧舍那誦我亦如是誦」(CBETA, T24, no. 1484, p. 1004, a12)
When it says, “Buddha’s original teacher’s precepts,” it only states recite and does not say elucidate – it is clear that this original teaching is not a new regulation.
Again it is stated, “The Buddhas of the three realms have taught it, are teaching it and will teach it.” Therefore we know it is the same teaching.
So it might be said that the Bodhisattva precepts are indeed an ancient teaching and that all Buddhas of the past relied upon it.