None of the dictionaries I have consulted has either Ankaufsschutz or Schutzzusagen, but the Zusagen could of course be commitments, engagements, promises or undertakings, with the first translation given for Zusage being "(com) promise". However, Zusagen aus Eigenmitteln (Fin) are "lendings from own resources" so, with some imagination, it could even have to do with lendings, but I suspect it is "Purchase protection promise" (or one of the other nouns above).
If, however, the Ankauf* could be construed as Ankäufer, it may be referring to "buyer/purchaser protection".

"purchase protection guarantee" and "purchase protection coverage"
would seem to mean the same, in principle, even not a literal translation