So I finally was able to decypher almost the entire text. Just 2 words elude me, but the meaning is obvious.
It is a grant of permission, kind of like a "royal charter", to a tailor, granting him permission to practice his trade.
The decyphered text as it is:

The rough translation of the text is as follows:
"... to the report of the royal office…. Of the 7. d. M. The resident and Tailor Johann Friedrich Dettmer of Hornbostel, the … sought after …. For the practice of the tailor trade in the village of Hornbostel, however only until further disposition and under the condition that he would practice the trade alongside budding journeymen and apprentices, and any other such helpers, and only for rural residents, is granted and the royal office…. to pay attention to it and to let pay attention, that the above named follows the condition set out herein.
Lüneburg the 20. Septbr. 1835
Royal …..
To
The Office….. Winsen a. d. Aller
Copy
For the tailor Johann Friedrich Dettmer zu Hornbostel"
The words im missing is the "Amts...." that comes after the "Königliche". "Amt" means office, such as a political office. So it must be a specific royal office.
Im also missing the second word on the 4th line, which, in context, could be something akin to "permission", even though I cannot decipher the german word.
And finally, im missing the 7th word on the second to last line. In context it could mean something like "applicant".
This was actually quite interesting to me as well, it felt like putting together a puzzle!