[breadbox]

It's sometimes hard to believe, but our current laws seems to allow that you can be forbidden from modifying a piece of software even for your own personal use.

[derefr]

I think where it would come into legal question is a situation more like "modifying our software, running the modified version on a server, and making a profit from the service that server provides." In other words, modifying for commercial use.

[elwell]

Even more interesting: copyright laws seems to indicate that playing/singing a song that someone else wrote, even in the shower, may be infringement.

[anigbrowl]

Um, no. You have to publish or perform it publicly to be infringing. If you sign it at home, or record yourself singing it at home, or record a copy of the original at home, you're still not infringing as long as you don't attempt to distribute it.

Unless your shower is located on a stage and you charge admission for people to listen to you sing in the shower, but I'm pretty sure that's not what you meant.