selling gpl software?

From: Date: Wed, 19 Mar 2008 16:11:24 +0000
Subject: selling gpl software?
Groups: php.general 
Request: Send a blank email to php-general+get-271811@lists.php.net to get a copy of this message
i know it is forbidden to sell open source software. let say i have costumer want me to modified an open source php script. i have the right to charge him the service to modified the software. but this costumer ask me to do one thing against the gpl software. he want me to remove all the link and powered by link (anything visible to the end user) what should i do to satisfy my costumer without making myself against the spirit of open source community?

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