"Internal documents show that Germany's domestic intelligence agency, the BfV, received the coveted software program XKeyscore from the NSA – and promised data from Germany in return." See the story: A Dubious Deal with the
“Internal documents show that Germany’s domestic intelligence agency, the BfV, received the coveted software program XKeyscore from the NSA – and promised data from Germany in return.”
See the story: A Dubious Deal with the NSA (Zeit Online, link)
And see: XKeyscore – the document: Document pertaining to the agreement between the NSA and Germany’s domestic intelligence agency BfV (link)