Software usage measurement apparatus for imposing a proper charg

Details Software usage measurement apparatus for imposing a proper charg Software usage measurement apparatus for imposing a proper charg

1995-07-24

1999-03-23

Lun, Le Hien

395840, 395854, G06F 1300

Patent

active

058871926

ABSTRACT:
A DES decrypting unit decrypts video data frames encrypted and compressed based on MPEG standards, when receiving them. The decrypted video data frames are expanded one by one in a MPEG expansion circuit. Each time the single frame is expanded, the MPEG expansion circuit outputs a completion-of-frame-expansion signal to a host control CPU. The host control CPU counts the completion-of-frame-expansion signals and reduces an accounting count value in an accounting data memory in accordance with this count value. The host control CPU outputs character pattern image data from a pattern generator and prohibits the decryption by the DES decrypting unit when the accounting count value becomes 0. The character pattern image data is superimposed on a video signal in an adder circuit.

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