Anti-virus

Is it worth "making an antivirus" but using virus databases from several antivrirus programmes?

Do you mean creating a new program using existing definitions?

Sure - then you can have it doing exactly what you want it too, and not what other people think you want it to do.

yeah thats it. Thanks

there are way better projects for you to work on.
Did you find AOL AV which uses Kaspersky definitions, become really popular?! NO.
You need permissions and licences, unless you use Clamwin definitions.