a guess-doesn't seem to be an overly used term. but since a sometimes reliable dico says a blocpolis is a blanket policy and I know that a blanket agreement/contract exists in English, waaroom niet..


Blanket order (Standing order):A contract under which a contractor or vendor agrees to provide goods or services to a purchaser on a demand basis; the contract generally establishes prices, terms, conditions, and the period covered, although no quantities are specified; shipments are to be made when and as required by the purchaser. Also called blanket agreement, blanket purchase, and standing order.
http://www.unc.edu/mds/ps/glossary.htm#blanket



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Note added at 27 mins (2007-06-20 20:48:00 GMT)
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or even waarom niet.....