Hi, I was noticed by someone in IRC #ocaml of otherslibs/num/README where we can read:
-=-=-=-=-=- LEGAL NOTICE: This work uses the BigNum package developed jointly by INRIA and Digital PRL. The code in the bignum/ subdirectory is copyright INRIA and Digital, and may be reproduced and distributed freely to non commercial usage according to the conditions stated in the documentation of this package (directory bignum/doc). -=-=-=-=-=- Yet another licensing issue? -- Jérôme Marant

