[Pooh_]

Originally Posted by CoronarJunkee

Just to be sure: You're saying that it's enough to create 20 pdfs on my pc that only differ by filename and they would be treated as different documents? That's great news.

Apparently, my English is very bad ...)))

I said, that if you want that your document does not interfered its own scribbles with other documents, it should differ from others by content! All your 20 pdfs should have different content! For example, on first page of all your PDFs you can place different titles: "Notes A", "Notes B", etc... This will produce 20 PDFs with different checksums.

Scribbles are stored (I think) in "\data\data\com.onyx.android.data\databases\on yx.s cribble.xxxxxxx.db" files and are not a part of your source document (and do not change its checksum) until you exported it. After the export you will get new PDF (exported) with new checksum. Checksum of the initial document remain unchanged, because its scribbles are stored separately.

Originally Posted by CoronarJunkee

My problem with the first method is:
5 steps?!? especially: removing all scribbles after exporting in order to clean up my document again

You haven't specified how many pages in your blank PDF.)) If your PDF have many pages, it is possible to Root your device and erase blank_pdf's scribbles manually (for example by copying empty scribble .db file into \data\data\com.onyx.android.data\databases\).

Originally Posted by CoronarJunkee

and: losing the possibility to edit my scribbles once they are exported.

That's almost true. I think, you can edit your scribbles using other pdf readers.

Originally Posted by CoronarJunkee

Also: when using that method, whatever new scribbles I might add to any of the exported documents would appear on all documents I've exported from the same original blank pdf.

That's not true. You tried to export few times the same blank document without scribbles. In my method, you will export the same blank document with different scribbles, so this will produce different PDFs.