Actually, it doesn't matter what license you use -- you'll always have your own code.
> Any possible restrictions I would place on them could only make it less free.
One person's restriction is another person's allowance. The GPL gives end users and developers a number of rights that they don't normally get with copyrighted works. BSD doesn't change the normal copyright rights of end users at all. So for some users in some situations, the GPL is more free than copyright, and by extension, the BSD license as well.
Actually, it doesn't matter what license you use -- you'll always have your own code.
> Any possible restrictions I would place on them could only make it less free.
One person's restriction is another person's allowance. The GPL gives end users and developers a number of rights that they don't normally get with copyrighted works. BSD doesn't change the normal copyright rights of end users at all. So for some users in some situations, the GPL is more free than copyright, and by extension, the BSD license as well.