How to (not) use GPL Software
The most common mistakes

The most common mistakes
not even once reading the GPL text and/or the FAQ from the FSF
not including the GPL license text with the product
not including a written offer with the product
not considering that the GPL also applies to software updates
only providing original source code (e.g. vanilla kernel.org kernel)
not including the "scripts to control installation"
only providing off-site hyperlinks to license and/ore source code
not responding to support requests for source code
charging rediculously high fees for physical shipping of source code