I\'ve encountered multiple third party .Net component-vendors that use a licensing scheme. On an evaluation copy, the components show up with a nag-screen or watermark or so
That's not correct. The licx file is very important and is necessary for the host app to be built with the correct license info embedded in it. So, its critical that the licx files be also included in source control. Otherwise a person checking out the source code on another machine will not get the licx file and the build may fail or not have the proper license info for the used components in the exe.