A data input/output management scheme suitable for protection of electronic writing data. Whether the data entered into the program is a protected data or not is judged, and when it is, at least the identifier for identifying the program is recorded as the protected data input record. Then, a data output...http://www.google.de/patents/US5870467?utm_source=gb-gplus-sharePatent US5870467 - Method and apparatus for data input/output management suitable for protection of electronic writing data
