Microsoft provides a wealth of critical information that you need to know about the registry in the Microsoft Knowledge Base at. Warning! Problems caused by improperly editing the Windows registry could render your computer operating system unusable. Note: editing the registry is dangerous, don't do this unless you are an Registry or IT expert or play one on tv. However you may feel about Draftsight, and similar free softwares that somewhat mimic AutoCAD, it doesn't make sense to me that AutoCAD should recognise drawings developed in this software as being developed in a student version of the software.AutoCAD LT does not have a 'profile' you can access through the Options dialog, however it's just registry entries, so you can access them and change the defaults if needed.

However, if I create a new drawing in Draftsight and then open it in AutoCAD lite the only warning is that it was developed in an application that was not developed by Autodesk, not that it has been created in a student version of AutoCAD. After saving it in Draftsight the same issue occurred. I tested this on a different drawing, which had only been worked on in AutoCAD lite and was opening without any warnings. Whilst the drawing was saved in an application that was not developed by Autodesk (it was originally exported from VW I believe and then edited in draftsight) it was never opened, edited or saved in any version of AutoCAD student software.

I recently opened a drawing in AutoCAD lite 2019 that had been edited and saved in the software Draftsight and received the warning that the drawing was saved with a student version of AutoCAD and would have a watermark stamp on it.

Apologies if this is a bit of a long post, I just want to try and explain the issue clearly.

Autocad lite 2019