This means working "on the side"

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Note added at 2003-12-11 16:50:27 (GMT)
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You could phrase it as \"working for anyone else prohibited\"

bijbaan = additional job or sideline, therefore extrapolating, I would say that this relates to a secondary job, probably with a competitor.

In a contract, you need a term like "other employment".

-> "The Employee agrees that during the term of this agreement, he or she will have no other employment except, as may be specifically authorised in writing by the Company."
http://www.smartonline.co.uk/pages/applications/entry-pages/...

-> "During the term of their employment agreements, Mr. Catmull and Mr. Reeves are prohibited from seeking other employment, except during the last six months of the term of the agreement..."
http://members.lycos.co.uk/dtimes/film/px_dir2.htm

-> "2.7 In Symbian v Christensen , an express clause preventing the employee from engaging in any other employment during the term of the contract was enforced by an injunction..."
http://www.industriallawsociety.org.uk/papers/goulding.htm

another possibility:

This policy is established to regulate secondary or part-time employment ("moonlighting") by employees within the Department of Administrative Services.
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The Department of Emergency Medicine discourages residents from moonlighting. However, we realize that for some residents it is an economic necessity. Although the department will permit moonlighting, such activities are limited according to the following stipulations