Jon Bing Proving Copyright Infringement of Computer Programs – Some practical Examples.

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Presentation transcript:

Jon Bing Proving Copyright Infringement of Computer Programs – Some practical Examples

Developing a computer program

Co-operation in developing a program

«One» program

User interface

Strategies in identifying interesting source code extracts Sorting on file names Sorting on file seize Indexing – inspecting variables identical or similar Calculating a hash value for each line of programming code

Comparing source code SJEKK-AVGR. MOVE 0 TO SJEKK SJEKK-10. SJEKK-10. IF WS-FRA = 0 AND WS-TIL = 0 GO TO SJEKK-20 IF WS-FRA NOT < WS-FRA1 AND WS-FRA NOT > WS-TIL1 GO TO SJEKK-TILSLAG. IF WS-TIL NOT < WS-FRA1 AND WS-TIL NOT > SJEKK-AVGR. MOVE 0 TO SJEKK SJEKK-10. IF WS-FRA = 0 AND WS-TIL = 0 GO TO SJEKK-20. IF WS-FRA NOT < WS-FRA1 AND WS-FRA NOT > WS-TIL1 GO TO SJEKK-TILSLAG IF WS-TIL NOT < WS-FRA1 AND WS-TIL NOT > GO TO SJEKK-TILSLAG.

External factors Programming language Standards Best practrice guides Boiler-plate text Third party components

Incremental development

Development process Time and resources used for development Experience

Pro-active strategies Clean room procedures Full documentation Original when possible (name of variables as an example)