English to Spanish Law/Patents Law: Contract(s) certification by notary

,... And in my presence voluntarily affixed her signature to the document annexed hereto to having first ackonwledged that she knows and fully understands the contents and legal meaning and consequences thereof and I have marked the said document with my Notarial Seal, and Act whereof being requested I have granted under Notarial Form and Seal of Office to serve and to avail as occassion may require.