Hmm, all the work you would do in your 'own time' would be owned (copyright-wise) by your employer then anyway, unless you'd explicitly excluded that in your contract. This is tricky part of the (Dutch) law, where the all work you do owned by your employer if it's the same kind of work you're employed to do. More info (in Dutch): http://www.iusmentis.com/auteursrecht/nl/vvv/maker/#werkgeve...